People Are Horrified When They Have to Torture a Virtual Person

In a virtual recreation of the infamous Milgram Shock Experiment, participants were just as reluctant to continue, even though no one was hurt.

Digital Shock

Back in 1961, psychologist Stanley Milgram shocked the world with controversial research in which everyday people followed a scientist’s instructions to electrocute someone who they thought was giving incorrect answers on a quiz — a damning indication that many people will acquiesce to brutal directives by an authority figure.

In December 2018, a team of London-based scientists repeated the experiment in a VR simulation in which they asked participants to zap a virtual avatar. Even though no one got hurt, participants were just as reluctant to pull the lever — even going so far as to try rigging the experiment so they didn’t have to, according to research published in the journal PLOSOne that breaks new ground in the psychology of how people relate to virtual characters.

Answer Key

During the experiment, participants quizzed a virtual character. A correct answer meant they could move on, while an incorrect answer meant the human participant had to administer a virtual electrical jolt. The scientists noticed that participants sometimes tried to feed the virtual avatar the correct answer by pronouncing it louder — in hopes that they wouldn’t be told to shock them.

And even though many participants continued to follow instructions, they were measurably stressed and anxious about doing so, the researchers write in a Scientific American blog post published Friday.

“At the end, even those who had cheated showed an increased stress level,” they wrote.

Big Picture

In their blog post, the scientists suggest that their research could be used to explain how people act under troubling leaders — just like how Milgram set out to explore the behavior of individual Nazis after World War II.

“If we look at our experiments as a proxy for resistance to authority, we can anticipate a psychological cost to the resisters. Even though their obedience isn’t genuine, those who persist endure additional stress compared to those who decide to quit,” they wrote. “In the long term they will also be facing the moral dilemma of engaged followership, wondering whether they engaged too much and in essence enabled a leader they did not want to obey.”

READ MORE: Would You Give a Virtual Electric Shock to an Avatar? [Scientific American]

More on Milgram: Why People Believe in Conspiracy Theories – and How to Change Their Minds

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People Are Horrified When They Have to Torture a Virtual Person

Fecal Transplants Reduce Symptoms of Autism Long Term

A new study shows that fecal transplants of healthy gut flora can help reduce the more severe symptoms of Autism Spectrum Disorder.

Follow-Up

New research suggests that fecal transplants can reduce the severity of conditions associated with Autism Spectrum Disorder (ASD) — and that the changes last several years after the transplants.

Back in 2017, Arizona State University conducted a study on children with ASD of varying severity. Now, research published Tuesday in the journal Scientific Reports shows that the reduction in ASD symptoms persisted for two years after the fact, further demonstrating the link between the gut microbiome and the brain.

Drastic Change

In the original study, 15 of the 18 children had what was considered severe autism, with difficulty communicating and handling social interactions. Two years after the study, which involved eight weeks of fecal transplants that reintroduced a greater variety of healthy microbial flora into the participants’ gastrointestinal tracts, only three participants still fall within the “severe” classification, according to the research.

“We are finding a very strong connection between the microbes that live in our intestines and signals that travel to the brain,” Arizona scientist Rosa Krajmalnik-Brown told New Atlas. “Two years later, the children are doing even better, which is amazing.”

Early Days

The scientists are now working to design a larger and more thorough clinical trial in hopes of getting their treatment approved for use by the FDA, according to New Atlas.

And while the goal isn’t to “cure” a condition that some argue doesn’t need curing, this study suggests that fecal transplants could someday provide people with a way to help children with specific communicative or social difficulties.

READ MORE: Fecal transplants result in massive long-term reduction in autism symptoms [New Atlas]

More on fecal transplants: New Study Supports the Link Between Autism and Gut Microbes

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Fecal Transplants Reduce Symptoms of Autism Long Term

The First Black Hole Photo Is Even More Amazing When You Zoom Out

A team from NASA's Chandra X-ray Observatory has shared an image that puts the first black hole photo into stunning context.

Photo Friends

The Event Horizon Telescope (EHT) wasn’t the only powerful device with its gaze fixed upon galaxy Messier 87 (M87) in April 2017.

While the EHT was focused on the event horizon of the black hole at the center of M87, NASA’s Chandra X-ray Observatory was taking a wider view of the same target — and the image produced through those observations puts the black hole photo into stunning context.

Credit, X-ray: NASA/CXC/Villanova University/J. Neilsen; Radio: Event Horizon Telescope Collaboration

1,000 Light Years

The Chandra team provided additional details on the dazzling display of bright particles captured in its black hole companion image in a blog post shared on Monday:

“While Chandra can’t see the shadow itself, its field of view is much larger than the EHT’s, so Chandra can view the full length of the jet of high-energy particles launched by the intense gravitational and magnetic fields around the black hole. This jet extends more than 1,000 light years from the center of the galaxy.”

Image Credit, X-ray: NASA/CXC/Villanova University/J. Neilsen; Radio: Event Horizon Telescope Collaboration

READ MORE: Chandra and the Event Horizon Telescope [Chandra X-Ray Observatory]

More on the black hole photoScientists Just Released the First-Ever Image of a Black Hole

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The First Black Hole Photo Is Even More Amazing When You Zoom Out

Astronomy – Wikipedia

Not to be confused with astrology, the pseudoscience.

Astronomy (from Greek: ) is a natural science that studies celestial objects and phenomena. It applies mathematics, physics, and chemistry in an effort to explain the origin of those objects and phenomena and their evolution. Objects of interest include planets, moons, stars, nebulae, galaxies, and comets; the phenomena also includes supernova explosions, gamma ray bursts, quasars, blazars, pulsars, and cosmic microwave background radiation. More generally, all phenomena that originate outside Earth’s atmosphere are within the purview of astronomy. A related but distinct subject is physical cosmology, which is the study of the Universe as a whole.[1]

Astronomy is one of the oldest of the natural sciences. The early civilizations in recorded history, such as the Babylonians, Greeks, Indians, Egyptians, Nubians, Iranians, Chinese, Maya, and many ancient indigenous peoples of the Americas, performed methodical observations of the night sky. Historically, astronomy has included disciplines as diverse as astrometry, celestial navigation, observational astronomy, and the making of calendars, but professional astronomy is now often considered to be synonymous with astrophysics.[2]

Professional astronomy is split into observational and theoretical branches. Observational astronomy is focused on acquiring data from observations of astronomical objects, which is then analyzed using basic principles of physics. Theoretical astronomy is oriented toward the development of computer or analytical models to describe astronomical objects and phenomena. The two fields complement each other, with theoretical astronomy seeking to explain observational results and observations being used to confirm theoretical results.

Astronomy is one of the few sciences in which amateurs still play an active role, especially in the discovery and observation of transient events. Amateur astronomers have made and contributed to many important astronomical discoveries, such as finding new comets.

Astronomy (from the Greek from astron, “star” and – -nomia from nomos, “law” or “culture”) means “law of the stars” (or “culture of the stars” depending on the translation). Astronomy should not be confused with astrology, the belief system which claims that human affairs are correlated with the positions of celestial objects.[5] Although the two fields share a common origin, they are now entirely distinct.[6]

Generally, both of the terms “astronomy” and “astrophysics” may be used to refer to the same subject.[7][8][9] Based on strict dictionary definitions, “astronomy” refers to “the study of objects and matter outside the Earth’s atmosphere and of their physical and chemical properties,”[10] while “astrophysics” refers to the branch of astronomy dealing with “the behavior, physical properties, and dynamic processes of celestial objects and phenomena.”[11] In some cases, as in the introduction of the introductory textbook The Physical Universe by Frank Shu, “astronomy” may be used to describe the qualitative study of the subject, whereas “astrophysics” is used to describe the physics-oriented version of the subject.[12] However, since most modern astronomical research deals with subjects related to physics, modern astronomy could actually be called astrophysics.[7] Some fields, such as astrometry, are purely astronomy rather than also astrophysics. Various departments in which scientists carry out research on this subject may use “astronomy” and “astrophysics”, partly depending on whether the department is historically affiliated with a physics department,[8] and many professional astronomers have physics rather than astronomy degrees.[9] Some titles of the leading scientific journals in this field include The Astronomical Journal, The Astrophysical Journal, and Astronomy and Astrophysics.

In early historic times, astronomy only consisted of the observation and predictions of the motions of objects visible to the naked eye. In some locations, early cultures assembled massive artifacts that possibly had some astronomical purpose. In addition to their ceremonial uses, these observatories could be employed to determine the seasons, an important factor in knowing when to plant crops and in understanding the length of the year.[13]

Before tools such as the telescope were invented, early study of the stars was conducted using the naked eye. As civilizations developed, most notably in Mesopotamia, Greece, Persia, India, China, Egypt, and Central America, astronomical observatories were assembled and ideas on the nature of the Universe began to develop. Most early astronomy consisted of mapping the positions of the stars and planets, a science now referred to as astrometry. From these observations, early ideas about the motions of the planets were formed, and the nature of the Sun, Moon and the Earth in the Universe were explored philosophically. The Earth was believed to be the center of the Universe with the Sun, the Moon and the stars rotating around it. This is known as the geocentric model of the Universe, or the Ptolemaic system, named after Ptolemy.[14]

A particularly important early development was the beginning of mathematical and scientific astronomy, which began among the Babylonians, who laid the foundations for the later astronomical traditions that developed in many other civilizations.[15] The Babylonians discovered that lunar eclipses recurred in a repeating cycle known as a saros.[16]

Following the Babylonians, significant advances in astronomy were made in ancient Greece and the Hellenistic world. Greek astronomy is characterized from the start by seeking a rational, physical explanation for celestial phenomena.[17] In the 3rd century BC, Aristarchus of Samos estimated the size and distance of the Moon and Sun, and he proposed a model of the Solar System where the Earth and planets rotated around the Sun, now called the heliocentric model.[18] In the 2nd century BC, Hipparchus discovered precession, calculated the size and distance of the Moon and invented the earliest known astronomical devices such as the astrolabe.[19] Hipparchus also created a comprehensive catalog of 1020 stars, and most of the constellations of the northern hemisphere derive from Greek astronomy.[20] The Antikythera mechanism (c. 15080 BC) was an early analog computer designed to calculate the location of the Sun, Moon, and planets for a given date. Technological artifacts of similar complexity did not reappear until the 14th century, when mechanical astronomical clocks appeared in Europe.[21]

Medieval Europe housed a number of important astronomers. Richard of Wallingford (12921336) made major contributions to astronomy and horology, including the invention of the first astronomical clock, the Rectangulus which allowed for the measurement of angles between planets and other astornomical bodies, as well as an equatorium called the Albion which could be used for astronomical calculations such as lunar, solar and planetary longitudes and could predict eclipses. Nicole Oresme (13201382) and Jean Buridan (13001361) first discussed evidence for the rotation of the Earth, furthermore, Buridan also developed the theory of impetus (predecessor of the modern scientific theory of inertia) which was able to show planets were capable of motion without the intervention of angels.[22] Georg von Peuerbach (14231461) and Regiomontanus (14361476) helped make astronomical progress instrumental to Copernicus’s development of the heliocentric model decades later.

Astronomy flourished in the Islamic world and other parts of the world. This led to the emergence of the first astronomical observatories in the Muslim world by the early 9th century.[23][24][25] In 964, the Andromeda Galaxy, the largest galaxy in the Local Group, was described by the Persian Muslim astronomer Abd al-Rahman al-Sufi in his Book of Fixed Stars.[26] The SN 1006 supernova, the brightest apparent magnitude stellar event in recorded history, was observed by the Egyptian Arabic astronomer Ali ibn Ridwan and Chinese astronomers in 1006. Some of the prominent Islamic (mostly Persian and Arab) astronomers who made significant contributions to the science include Al-Battani, Thebit, Abd al-Rahman al-Sufi, Albumasar, Biruni, Ab Ishq Ibrhm al-Zarql, Al-Birjandi, and the astronomers of the Maragheh and Samarkand observatories. Persian astrologer Albumasar’s practical manuals for training astrologers profoundly influenced Muslim intellectual history and, through translations, that of western Europe and Byzantium.[27] His work was probably the single most important original source for the recovery of Aristotle for medieval European scholars prior to the middle of the 12th century.[28] The criticism of Ptolemy by Averroes directly influenced the Copernicus’s heliocentrism.[29] Astronomers during that time introduced many Arabic names now used for individual stars.[30][31] It is also believed that the ruins at Great Zimbabwe and Timbuktu[32] may have housed astronomical observatories.[33] Europeans had previously believed that there had been no astronomical observation in sub-Saharan Africa during the pre-colonial Middle Ages, but modern discoveries show otherwise.[34][35][36][37]

For over six centuries (from the recovery of ancient learning during the late Middle Ages into the Enlightenment), the Roman Catholic Church gave more financial and social support to the study of astronomy than probably all other institutions. Among the Church’s motives was finding the date for Easter.[38]

During the Renaissance, Nicolaus Copernicus proposed a heliocentric model of the solar system. His work was defended by Galileo Galilei and expanded upon by Johannes Kepler. Kepler was the first to devise a system that correctly described the details of the motion of the planets around the Sun. However, Kepler did not succeed in formulating a theory behind the laws he wrote down.[39] It was Isaac Newton, with his invention of celestial dynamics and his law of gravitation, who finally explained the motions of the planets. Newton also developed the reflecting telescope.[40]

Improvements in the size and quality of the telescope led to further discoveries. The English astronomer John Flamsteed catalogued over 3000 stars,[41] More extensive star catalogues were produced by Nicolas Louis de Lacaille. The astronomer William Herschel made a detailed catalog of nebulosity and clusters, and in 1781 discovered the planet Uranus, the first new planet found.[42] The distance to a star was announced in 1838 when the parallax of 61 Cygni was measured by Friedrich Bessel.[43]

During the 1819th centuries, the study of the three-body problem by Leonhard Euler, Alexis Claude Clairaut, and Jean le Rond d’Alembert led to more accurate predictions about the motions of the Moon and planets. This work was further refined by Joseph-Louis Lagrange and Pierre Simon Laplace, allowing the masses of the planets and moons to be estimated from their perturbations.[44]

Significant advances in astronomy came about with the introduction of new technology, including the spectroscope and photography. Joseph von Fraunhofer discovered about 600 bands in the spectrum of the Sun in 181415, which, in 1859, Gustav Kirchhoff ascribed to the presence of different elements. Stars were proven to be similar to the Earth’s own Sun, but with a wide range of temperatures, masses, and sizes.[30]

The existence of the Earth’s galaxy, the Milky Way, as its own group of stars was only proved in the 20th century, along with the existence of “external” galaxies. The observed recession of those galaxies led to the discovery of the expansion of the Universe.[45] Theoretical astronomy led to speculations on the existence of objects such as black holes and neutron stars, which have been used to explain such observed phenomena as quasars, pulsars, blazars, and radio galaxies. Physical cosmology made huge advances during the 20th century. In the early 1900s the model of the Big Bang theory was formulated, heavily evidenced by cosmic microwave background radiation, Hubble’s law, and the cosmological abundances of elements. Space telescopes have enabled measurements in parts of the electromagnetic spectrum normally blocked or blurred by the atmosphere.[citation needed] In February 2016, it was revealed that the LIGO project had detected evidence of gravitational waves in the previous September.[46][47]

The main source of information about celestial bodies and other objects is visible light, or more generally electromagnetic radiation.[48] Observational astronomy may be categorized according to the corresponding region of the electromagnetic spectrum on which the observations are made. Some parts of the spectrum can be observed from the Earth’s surface, while other parts are only observable from either high altitudes or outside the Earth’s atmosphere. Specific information on these subfields is given below.

Radio astronomy uses radiation with wavelengths greater than approximately one millimeter, outside the visible range.[49] Radio astronomy is different from most other forms of observational astronomy in that the observed radio waves can be treated as waves rather than as discrete photons. Hence, it is relatively easier to measure both the amplitude and phase of radio waves, whereas this is not as easily done at shorter wavelengths.[49]

Although some radio waves are emitted directly by astronomical objects, a product of thermal emission, most of the radio emission that is observed is the result of synchrotron radiation, which is produced when electrons orbit magnetic fields.[49] Additionally, a number of spectral lines produced by interstellar gas, notably the hydrogen spectral line at 21cm, are observable at radio wavelengths.[12][49]

A wide variety of other objects are observable at radio wavelengths, including supernovae, interstellar gas, pulsars, and active galactic nuclei.[12][49]

Infrared astronomy is founded on the detection and analysis of infrared radiation, wavelengths longer than red light and outside the range of our vision. The infrared spectrum is useful for studying objects that are too cold to radiate visible light, such as planets, circumstellar disks or nebulae whose light is blocked by dust. The longer wavelengths of infrared can penetrate clouds of dust that block visible light, allowing the observation of young stars embedded in molecular clouds and the cores of galaxies. Observations from the Wide-field Infrared Survey Explorer (WISE) have been particularly effective at unveiling numerous Galactic protostars and their host star clusters.[51][52]With the exception of infrared wavelengths close to visible light, such radiation is heavily absorbed by the atmosphere, or masked, as the atmosphere itself produces significant infrared emission. Consequently, infrared observatories have to be located in high, dry places on Earth or in space.[53] Some molecules radiate strongly in the infrared. This allows the study of the chemistry of space; more specifically it can detect water in comets.[54]

Historically, optical astronomy, also called visible light astronomy, is the oldest form of astronomy.[55] Images of observations were originally drawn by hand. In the late 19th century and most of the 20th century, images were made using photographic equipment. Modern images are made using digital detectors, particularly using charge-coupled devices (CCDs) and recorded on modern medium. Although visible light itself extends from approximately 4000 to 7000 (400 nm to 700nm),[55] that same equipment can be used to observe some near-ultraviolet and near-infrared radiation.

Ultraviolet astronomy employs ultraviolet wavelengths between approximately 100 and 3200 (10 to 320nm).[49] Light at those wavelengths is absorbed by the Earth’s atmosphere, requiring observations at these wavelengths to be performed from the upper atmosphere or from space. Ultraviolet astronomy is best suited to the study of thermal radiation and spectral emission lines from hot blue stars (OB stars) that are very bright in this wave band. This includes the blue stars in other galaxies, which have been the targets of several ultraviolet surveys. Other objects commonly observed in ultraviolet light include planetary nebulae, supernova remnants, and active galactic nuclei.[49] However, as ultraviolet light is easily absorbed by interstellar dust, an adjustment of ultraviolet measurements is necessary.[49]

X-ray astronomy uses X-ray wavelengths. Typically, X-ray radiation is produced by synchrotron emission (the result of electrons orbiting magnetic field lines), thermal emission from thin gases above 107 (10million) kelvins, and thermal emission from thick gases above 107 Kelvin.[49] Since X-rays are absorbed by the Earth’s atmosphere, all X-ray observations must be performed from high-altitude balloons, rockets, or X-ray astronomy satellites. Notable X-ray sources include X-ray binaries, pulsars, supernova remnants, elliptical galaxies, clusters of galaxies, and active galactic nuclei.[49]

Gamma ray astronomy observes astronomical objects at the shortest wavelengths of the electromagnetic spectrum. Gamma rays may be observed directly by satellites such as the Compton Gamma Ray Observatory or by specialized telescopes called atmospheric Cherenkov telescopes.[49] The Cherenkov telescopes do not detect the gamma rays directly but instead detect the flashes of visible light produced when gamma rays are absorbed by the Earth’s atmosphere.[56]

Most gamma-ray emitting sources are actually gamma-ray bursts, objects which only produce gamma radiation for a few milliseconds to thousands of seconds before fading away. Only 10% of gamma-ray sources are non-transient sources. These steady gamma-ray emitters include pulsars, neutron stars, and black hole candidates such as active galactic nuclei.[49]

In addition to electromagnetic radiation, a few other events originating from great distances may be observed from the Earth.

In neutrino astronomy, astronomers use heavily shielded underground facilities such as SAGE, GALLEX, and Kamioka II/III for the detection of neutrinos. The vast majority of the neutrinos streaming through the Earth originate from the Sun, but 24 neutrinos were also detected from supernova 1987A.[49] Cosmic rays, which consist of very high energy particles (atomic nuclei) that can decay or be absorbed when they enter the Earth’s atmosphere, result in a cascade of secondary particles which can be detected by current observatories.[57] Some future neutrino detectors may also be sensitive to the particles produced when cosmic rays hit the Earth’s atmosphere.[49]

Gravitational-wave astronomy is an emerging field of astronomy that employs gravitational-wave detectors to collect observational data about distant massive objects. A few observatories have been constructed, such as the Laser Interferometer Gravitational Observatory LIGO. LIGO made its first detection on 14 September 2015, observing gravitational waves from a binary black hole.[58] A second gravitational wave was detected on 26 December 2015 and additional observations should continue but gravitational waves require extremely sensitive instruments.[59][60]

The combination of observations made using electromagnetic radiation, neutrinos or gravitational waves and other complementary information, is known as multi-messenger astronomy.[61][62]

One of the oldest fields in astronomy, and in all of science, is the measurement of the positions of celestial objects. Historically, accurate knowledge of the positions of the Sun, Moon, planets and stars has been essential in celestial navigation (the use of celestial objects to guide navigation) and in the making of calendars.

Careful measurement of the positions of the planets has led to a solid understanding of gravitational perturbations, and an ability to determine past and future positions of the planets with great accuracy, a field known as celestial mechanics. More recently the tracking of near-Earth objects will allow for predictions of close encounters or potential collisions of the Earth with those objects.[63]

The measurement of stellar parallax of nearby stars provides a fundamental baseline in the cosmic distance ladder that is used to measure the scale of the Universe. Parallax measurements of nearby stars provide an absolute baseline for the properties of more distant stars, as their properties can be compared. Measurements of the radial velocity and proper motion of stars allows astronomers to plot the movement of these systems through the Milky Way galaxy. Astrometric results are the basis used to calculate the distribution of speculated dark matter in the galaxy.[64]

During the 1990s, the measurement of the stellar wobble of nearby stars was used to detect large extrasolar planets orbiting those stars.[65]

Theoretical astronomers use several tools including analytical models and computational numerical simulations; each has its particular advantages. Analytical models of a process are generally better for giving broader insight into the heart of what is going on. Numerical models reveal the existence of phenomena and effects otherwise unobserved.[66][67]

Theorists in astronomy endeavor to create theoretical models and from the results predict observational consequences of those models. The observation of a phenomenon predicted by a model allows astronomers to select between several alternate or conflicting models as the one best able to describe the phenomena.

Theorists also try to generate or modify models to take into account new data. In the case of an inconsistency between the data and model’s results, the general tendency is to try to make minimal modifications to the model so that it produces results that fit the data. In some cases, a large amount of inconsistent data over time may lead to total abandonment of a model.

Phenomena modeled by theoretical astronomers include: stellar dynamics and evolution; galaxy formation; large-scale distribution of matter in the Universe; origin of cosmic rays; general relativity and physical cosmology, including string cosmology and astroparticle physics. Astrophysical relativity serves as a tool to gauge the properties of large scale structures for which gravitation plays a significant role in physical phenomena investigated and as the basis for black hole (astro)physics and the study of gravitational waves.

Some widely accepted and studied theories and models in astronomy, now included in the Lambda-CDM model are the Big Bang, Cosmic inflation, dark matter, and fundamental theories of physics.

A few examples of this process:

Dark matter and dark energy are the current leading topics in astronomy,[68] as their discovery and controversy originated during the study of the galaxies.

Astrophysics is the branch of astronomy that employs the principles of physics and chemistry “to ascertain the nature of the astronomical objects, rather than their positions or motions in space”.[69][70] Among the objects studied are the Sun, other stars, galaxies, extrasolar planets, the interstellar medium and the cosmic microwave background.[71][72] Their emissions are examined across all parts of the electromagnetic spectrum, and the properties examined include luminosity, density, temperature, and chemical composition. Because astrophysics is a very broad subject, astrophysicists typically apply many disciplines of physics, including mechanics, electromagnetism, statistical mechanics, thermodynamics, quantum mechanics, relativity, nuclear and particle physics, and atomic and molecular physics.

In practice, modern astronomical research often involves a substantial amount of work in the realms of theoretical and observational physics. Some areas of study for astrophysicists include their attempts to determine the properties of dark matter, dark energy, and black holes; whether or not time travel is possible, wormholes can form, or the multiverse exists; and the origin and ultimate fate of the universe.[71] Topics also studied by theoretical astrophysicists include Solar System formation and evolution; stellar dynamics and evolution; galaxy formation and evolution; magnetohydrodynamics; large-scale structure of matter in the universe; origin of cosmic rays; general relativity and physical cosmology, including string cosmology and astroparticle physics.

Astrochemistry is the study of the abundance and reactions of molecules in the Universe, and their interaction with radiation.[73] The discipline is an overlap of astronomy and chemistry. The word “astrochemistry” may be applied to both the Solar System and the interstellar medium. The study of the abundance of elements and isotope ratios in Solar System objects, such as meteorites, is also called cosmochemistry, while the study of interstellar atoms and molecules and their interaction with radiation is sometimes called molecular astrophysics. The formation, atomic and chemical composition, evolution and fate of molecular gas clouds is of special interest, because it is from these clouds that solar systems form.

Studies in this field contribute to the understanding of the formation of the Solar System, Earth’s origin and geology, abiogenesis, and the origin of climate and oceans.

Astrobiology is an interdisciplinary scientific field concerned with the origins, early evolution, distribution, and future of life in the universe. Astrobiology considers the question of whether extraterrestrial life exists, and how humans can detect it if it does.[74] The term exobiology is similar.[75]

Astrobiology makes use of molecular biology, biophysics, biochemistry, chemistry, astronomy, physical cosmology, exoplanetology and geology to investigate the possibility of life on other worlds and help recognize biospheres that might be different from that on Earth.[76] The origin and early evolution of life is an inseparable part of the discipline of astrobiology.[77] Astrobiology concerns itself with interpretation of existing scientific data, and although speculation is entertained to give context, astrobiology concerns itself primarily with hypotheses that fit firmly into existing scientific theories.

This interdisciplinary field encompasses research on the origin of planetary systems, origins of organic compounds in space, rock-water-carbon interactions, abiogenesis on Earth, planetary habitability, research on biosignatures for life detection, and studies on the potential for life to adapt to challenges on Earth and in outer space.[78][79][80]

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Cosmology (from the Greek (kosmos) “world, universe” and (logos) “word, study” or literally “logic”) could be considered the study of the Universe as a whole.

Observations of the large-scale structure of the Universe, a branch known as physical cosmology, have provided a deep understanding of the formation and evolution of the cosmos. Fundamental to modern cosmology is the well-accepted theory of the big bang, wherein our Universe began at a single point in time, and thereafter expanded over the course of 13.8 billion years[81] to its present condition.[82] The concept of the big bang can be traced back to the discovery of the microwave background radiation in 1965.[82]

In the course of this expansion, the Universe underwent several evolutionary stages. In the very early moments, it is theorized that the Universe experienced a very rapid cosmic inflation, which homogenized the starting conditions. Thereafter, nucleosynthesis produced the elemental abundance of the early Universe.[82] (See also nucleocosmochronology.)

When the first neutral atoms formed from a sea of primordial ions, space became transparent to radiation, releasing the energy viewed today as the microwave background radiation. The expanding Universe then underwent a Dark Age due to the lack of stellar energy sources.[83]

A hierarchical structure of matter began to form from minute variations in the mass density of space. Matter accumulated in the densest regions, forming clouds of gas and the earliest stars, the Population III stars. These massive stars triggered the reionization process and are believed to have created many of the heavy elements in the early Universe, which, through nuclear decay, create lighter elements, allowing the cycle of nucleosynthesis to continue longer.[84]

Gravitational aggregations clustered into filaments, leaving voids in the gaps. Gradually, organizations of gas and dust merged to form the first primitive galaxies. Over time, these pulled in more matter, and were often organized into groups and clusters of galaxies, then into larger-scale superclusters.[85]

Various fields of physics are crucial to studying the universe. Interdisciplinary studies involve the fields of quantum mechanics, particle physics, plasma physics, condensed matter physics, statistical mechanics, optics, and nuclear physics.

Fundamental to the structure of the Universe is the existence of dark matter and dark energy. These are now thought to be its dominant components, forming 96% of the mass of the Universe. For this reason, much effort is expended in trying to understand the physics of these components.[86]

The study of objects outside our galaxy is a branch of astronomy concerned with the formation and evolution of Galaxies, their morphology (description) and classification, the observation of active galaxies, and at a larger scale, the groups and clusters of galaxies. Finally, the latter is important for the understanding of the large-scale structure of the cosmos.

Most galaxies are organized into distinct shapes that allow for classification schemes. They are commonly divided into spiral, elliptical and Irregular galaxies.[87]

As the name suggests, an elliptical galaxy has the cross-sectional shape of an ellipse. The stars move along random orbits with no preferred direction. These galaxies contain little or no interstellar dust, few star-forming regions, and generally older stars. Elliptical galaxies are more commonly found at the core of galactic clusters, and may have been formed through mergers of large galaxies.

A spiral galaxy is organized into a flat, rotating disk, usually with a prominent bulge or bar at the center, and trailing bright arms that spiral outward. The arms are dusty regions of star formation within which massive young stars produce a blue tint. Spiral galaxies are typically surrounded by a halo of older stars. Both the Milky Way and one of our nearest galaxy neighbors, the Andromeda Galaxy, are spiral galaxies.

Irregular galaxies are chaotic in appearance, and are neither spiral nor elliptical. About a quarter of all galaxies are irregular, and the peculiar shapes of such galaxies may be the result of gravitational interaction.

An active galaxy is a formation that emits a significant amount of its energy from a source other than its stars, dust and gas. It is powered by a compact region at the core, thought to be a super-massive black hole that is emitting radiation from in-falling material.

A radio galaxy is an active galaxy that is very luminous in the radio portion of the spectrum, and is emitting immense plumes or lobes of gas. Active galaxies that emit shorter frequency, high-energy radiation include Seyfert galaxies, Quasars, and Blazars. Quasars are believed to be the most consistently luminous objects in the known universe.[88]

The large-scale structure of the cosmos is represented by groups and clusters of galaxies. This structure is organized into a hierarchy of groupings, with the largest being the superclusters. The collective matter is formed into filaments and walls, leaving large voids between.[89]

The Solar System orbits within the Milky Way, a barred spiral galaxy that is a prominent member of the Local Group of galaxies. It is a rotating mass of gas, dust, stars and other objects, held together by mutual gravitational attraction. As the Earth is located within the dusty outer arms, there are large portions of the Milky Way that are obscured from view.

In the center of the Milky Way is the core, a bar-shaped bulge with what is believed to be a supermassive black hole at its center. This is surrounded by four primary arms that spiral from the core. This is a region of active star formation that contains many younger, population I stars. The disk is surrounded by a spheroid halo of older, population II stars, as well as relatively dense concentrations of stars known as globular clusters.[90]

Between the stars lies the interstellar medium, a region of sparse matter. In the densest regions, molecular clouds of molecular hydrogen and other elements create star-forming regions. These begin as a compact pre-stellar core or dark nebulae, which concentrate and collapse (in volumes determined by the Jeans length) to form compact protostars.[91]

As the more massive stars appear, they transform the cloud into an H II region (ionized atomic hydrogen) of glowing gas and plasma. The stellar wind and supernova explosions from these stars eventually cause the cloud to disperse, often leaving behind one or more young open clusters of stars. These clusters gradually disperse, and the stars join the population of the Milky Way.[92]

Kinematic studies of matter in the Milky Way and other galaxies have demonstrated that there is more mass than can be accounted for by visible matter. A dark matter halo appears to dominate the mass, although the nature of this dark matter remains undetermined.[93]

The study of stars and stellar evolution is fundamental to our understanding of the Universe. The astrophysics of stars has been determined through observation and theoretical understanding; and from computer simulations of the interior.[94] Star formation occurs in dense regions of dust and gas, known as giant molecular clouds. When destabilized, cloud fragments can collapse under the influence of gravity, to form a protostar. A sufficiently dense, and hot, core region will trigger nuclear fusion, thus creating a main-sequence star.[91]

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Astronomy – Wikipedia

astronomy | Definition & Facts | Britannica.com

Since the late 19th century astronomy has expanded to include astrophysics, the application of physical and chemical knowledge to an understanding of the nature of celestial objects and the physical processes that control their formation, evolution, and emission of radiation. In addition, the gases and dust particles around and between the stars have become the subjects of much research. Study of the nuclear reactions that provide the energy radiated by stars has shown how the diversity of atoms found in nature can be derived from a universe that, following the first few minutes of its existence, consisted only of hydrogen, helium, and a trace of lithium. Concerned with phenomena on the largest scale is cosmology, the study of the evolution of the universe. Astrophysics has transformed cosmology from a purely speculative activity to a modern science capable of predictions that can be tested.

Its great advances notwithstanding, astronomy is still subject to a major constraint: it is inherently an observational rather than an experimental science. Almost all measurements must be performed at great distances from the objects of interest, with no control over such quantities as their temperature, pressure, or chemical composition. There are a few exceptions to this limitationnamely, meteorites (most of which are from the asteroid belt, though some are from the Moon or Mars), rock and soil samples brought back from the Moon, samples of comet and asteroid dust returned by robotic spacecraft, and interplanetary dust particles collected in or above the stratosphere. These can be examined with laboratory techniques to provide information that cannot be obtained in any other way. In the future, space missions may return surface materials from Mars, or other objects, but much of astronomy appears otherwise confined to Earth-based observations augmented by observations from orbiting satellites and long-range space probes and supplemented by theory.

The solar system took shape 4.57 billion years ago, when it condensed within a large cloud of gas and dust. Gravitational attraction holds the planets in their elliptical orbits around the Sun. In addition to Earth, five major planets (Mercury, Venus, Mars, Jupiter, and Saturn) have been known from ancient times. Since then only two more have been discovered: Uranus by accident in 1781 and Neptune in 1846 after a deliberate search following a theoretical prediction based on observed irregularities in the orbit of Uranus. Pluto, discovered in 1930 after a search for a planet predicted to lie beyond Neptune, was considered a major planet until 2006, when it was redesignated a dwarf planet by the International Astronomical Union.

The average Earth-Sun distance, which originally defined the astronomical unit (AU), provides a convenient measure for distances within the solar system. The astronomical unit was originally defined by observations of the mean radius of Earths orbit but is now defined as 149,597,870.7 km (about 93 million miles). Mercury, at 0.4 AU, is the closest planet to the Sun, while Neptune, at 30.1 AU, is the farthest. Plutos orbit, with a mean radius of 39.5 AU, is sufficiently eccentric that at times it is closer to the Sun than is Neptune. The planes of the planetary orbits are all within a few degrees of the ecliptic, the plane that contains Earths orbit around the Sun. As viewed from far above Earths North Pole, all planets move in the same (counterclockwise) direction in their orbits.

Most of the mass of the solar system is concentrated in the Sun, with its 1.99 1033 grams. Together, all of the planets amount to 2.7 1030 grams (i.e., about one-thousandth of the Suns mass), and Jupiter alone accounts for 71 percent of this amount. The solar system also contains five known objects of intermediate size classified as dwarf planets and a very large number of much smaller objects collectively called small bodies. The small bodies, roughly in order of decreasing size, are the asteroids, or minor planets; comets, including Kuiper belt, Centaur, and Oort cloud objects; meteoroids; and interplanetary dust particles. Because of their starlike appearance when discovered, the largest of these bodies were termed asteroids, and that name is widely used, but, now that the rocky nature of these bodies is understood, their more descriptive name is minor planets.

The four inner, terrestrial planetsMercury, Venus, Earth, and Marsalong with the Moon have average densities in the range of 3.95.5 grams per cubic cm, setting them apart from the four outer, giant planetsJupiter, Saturn, Uranus, and Neptunewhose densities are all close to 1 gram per cubic cm, the density of water. The compositions of these two groups of planets must therefore be significantly different. This dissimilarity is thought to be attributable to conditions that prevailed during the early development of the solar system (see below Theories of origin). Planetary temperatures now range from around 170 C (330 F, 440 K) on Mercurys surface through the typical 15 C (60 F, 290 K) on Earth to 135 C (210 F, 140 K) on Jupiter near its cloud tops and down to 210 C (350 F, 60 K) near Neptunes cloud tops. These are average temperatures; large variations exist between dayside and nightside for planets closest to the Sun, except for Venus with its thick atmosphere.

The surfaces of the terrestrial planets and many satellites show extensive cratering, produced by high-speed impacts (see meteorite crater). On Earth, with its large quantities of water and an active atmosphere, many of these cosmic footprints have eroded, but remnants of very large craters can be seen in aerial and spacecraft photographs of the terrestrial surface. On Mercury, Mars, and the Moon, the absence of water and any significant atmosphere has left the craters unchanged for billions of years, apart from disturbances produced by infrequent later impacts. Volcanic activity has been an important force in the shaping of the surfaces of the Moon and the terrestrial planets. Seismic activity on the Moon has been monitored by means of seismometers left on its surface by Apollo astronauts and by Lunokhod robotic rovers. Cratering on the largest scale seems to have ceased about three billion years ago, although on the Moon there is clear evidence for a continued cosmic drizzle of small particles, with the larger objects churning (gardening) the lunar surface and the smallest producing microscopic impact pits in crystals in the lunar rocks.

All of the planets apart from the two closest to the Sun (Mercury and Venus) have natural satellites (moons) that are very diverse in appearance, size, and structure, as revealed in close-up observations from long-range space probes. The four outer dwarf planets have moons; Pluto has at least five moons, including one, Charon, fully half the size of Pluto itself. Over 200 asteroids and 80 Kuiper belt objects also have moons. Four planets (Jupiter, Saturn, Uranus, and Neptune), one dwarf planet (Haumea), and one Centaur object (Chariklo) have rings, disklike systems of small rocks and particles that orbit their parent bodies.

During the U.S. Apollo missions a total weight of 381.7 kg (841.5 pounds) of lunar material was collected; an additional 300 grams (0.66 pounds) was brought back by unmanned Soviet Luna vehicles. About 15 percent of the Apollo samples have been distributed for analysis, with the remainder stored at the NASA Johnson Space Center, Houston, Texas. The opportunity to employ a wide range of laboratory techniques on these lunar samples has revolutionized planetary science. The results of the analyses have enabled investigators to determine the composition and age of the lunar surface. Seismic observations have made it possible to probe the lunar interior. In addition, retroreflectors left on the Moons surface by Apollo astronauts have allowed high-power laser beams to be sent from Earth to the Moon and back, permitting scientists to monitor the Earth-Moon distance to an accuracy of a few centimetres. This experiment, which has provided data used in calculations of the dynamics of the Earth-Moon system, has shown that the separation of the two bodies is increasing by 4.4 cm (1.7 inches) each year. (For additional information on lunar studies, see Moon.)

Mercury is too hot to retain an atmosphere, but Venuss brilliant white appearance is the result of its being completely enveloped in thick clouds of carbon dioxide, impenetrable at visible wavelengths. Below the upper clouds, Venus has a hostile atmosphere containing clouds of sulfuric acid droplets. The cloud cover shields the planets surface from direct sunlight, but the energy that does filter through warms the surface, which then radiates at infrared wavelengths. The long-wavelength infrared radiation is trapped by the dense clouds such that an efficient greenhouse effect keeps the surface temperature near 465 C (870 F, 740 K). Radar, which can penetrate the thick Venusian clouds, has been used to map the planets surface. In contrast, the atmosphere of Mars is very thin and is composed mostly of carbon dioxide (95 percent), with very little water vapour; the planets surface pressure is only about 0.006 that of Earth. The outer planets have atmospheres composed largely of light gases, mainly hydrogen and helium.

Each planet rotates on its axis, and nearly all of them rotate in the same directioncounterclockwise as viewed from above the ecliptic. The two exceptions are Venus, which rotates in the clockwise direction beneath its cloud cover, and Uranus, which has its rotation axis very nearly in the plane of the ecliptic.

Some of the planets have magnetic fields. Earths field extends outward until it is disturbed by the solar windan outward flow of protons and electrons from the Sunwhich carries a magnetic field along with it. Through processes not yet fully understood, particles from the solar wind and galactic cosmic rays (high-speed particles from outside the solar system) populate two doughnut-shaped regions called the Van Allen radiation belts. The inner belt extends from about 1,000 to 5,000 km (600 to 3,000 miles) above Earths surface, and the outer from roughly 15,000 to 25,000 km (9,300 to 15,500 miles). In these belts, trapped particles spiral along paths that take them around Earth while bouncing back and forth between the Northern and Southern hemispheres, with their orbits controlled by Earths magnetic field. During periods of increased solar activity, these regions of trapped particles are disturbed, and some of the particles move down into Earths atmosphere, where they collide with atoms and molecules to produce auroras.

Jupiter has a magnetic field far stronger than Earths and many more trapped electrons, whose synchrotron radiation (electromagnetic radiation emitted by high-speed charged particles that are forced to move in curved paths, as under the influence of a magnetic field) is detectable from Earth. Bursts of increased radio emission are correlated with the position of Io, the innermost of the four Galilean moons of Jupiter. Saturn has a magnetic field that is much weaker than Jupiters, but it too has a region of trapped particles. Mercury has a weak magnetic field that is only about 1 percent as strong as Earths and shows no evidence of trapped particles. Uranus and Neptune have fields that are less than one-tenth the strength of Saturns and appear much more complex than that of Earth. No field has been detected around Venus or Mars.

More than 500,000 asteroids with well-established orbits are known, and thousands of additional objects are discovered each year. Hundreds of thousands more have been seen, but their orbits have not been as well determined. It is estimated that several million asteroids exist, but most are small, and their combined mass is estimated to be less than a thousandth that of Earth. Most of the asteroids have orbits close to the ecliptic and move in the asteroid belt, between 2.3 and 3.3 AU from the Sun. Because some asteroids travel in orbits that can bring them close to Earth, there is a possibility of a collision that could have devastating results (see Earth impact hazard).

Comets are considered to come from a vast reservoir, the Oort cloud, orbiting the Sun at distances of 20,00050,000 AU or more and containing trillions of icy objectslatent comet nucleiwith the potential to become active comets. Many comets have been observed over the centuries. Most make only a single pass through the inner solar system, but some are deflected by Jupiter or Saturn into orbits that allow them to return at predictable times. Halleys Comet is the best known of these periodic comets; its next return into the inner solar system is predicted for 2061. Many short-period comets are thought to come from the Kuiper belt, a region lying mainly between 30 AU and 50 AU from the Sunbeyond Neptunes orbit but including part of Plutosand housing perhaps hundreds of millions of comet nuclei. Very few comet masses have been well determined, but most are probably less than 1018 grams, one-billionth the mass of Earth.

Since the 1990s more than a thousand comet nuclei in the Kuiper belt have been observed with large telescopes; a few are about half the size of Pluto, and Pluto is the largest Kuiper belt object. Plutos orbital and physical characteristics had long caused it to be regarded as an anomaly among the planets. However, after the discovery of numerous other Pluto-like objects beyond Neptune, Pluto was seen to be no longer unique in its neighbourhood but rather a giant member of the local population. Consequently, in 2006 astronomers at the general assembly of the International Astronomical Union elected to create the new category of dwarf planets for objects with such qualifications. Pluto, Eris, and Ceres, the latter being the largest member of the asteroid belt, were given this distinction. Two other Kuiper belt objects, Makemake and Haumea, were also designated as dwarf planets.

Smaller than the observed asteroids and comets are the meteoroids, lumps of stony or metallic material believed to be mostly fragments of asteroids. Meteoroids vary from small rocks to boulders weighing a ton or more. A relative few have orbits that bring them into Earths atmosphere and down to the surface as meteorites. Most meteorites that have been collected on Earth are probably from asteroids. A few have been identified as being from the Moon, Mars, or the asteroid Vesta.

Meteorites are classified into three broad groups: stony (chondrites and achondrites; about 94 percent), iron (5 percent), and stony-iron (1 percent). Most meteoroids that enter the atmosphere heat up sufficiently to glow and appear as meteors, and the great majority of these vaporize completely or break up before they reach the surface. Many, perhaps most, meteors occur in showers (see meteor shower) and follow orbits that seem to be identical with those of certain comets, thus pointing to a cometary origin. For example, each May, when Earth crosses the orbit of Halleys Comet, the Eta Aquarid meteor shower occurs. Micrometeorites (interplanetary dust particles), the smallest meteoroidal particles, can be detected from Earth-orbiting satellites or collected by specially equipped aircraft flying in the stratosphere and returned for laboratory inspection. Since the late 1960s numerous meteorites have been found in the Antarctic on the surface of stranded ice flows (see Antarctic meteorites). Some meteorites contain microscopic crystals whose isotopic proportions are unique and appear to be dust grains that formed in the atmospheres of different stars.

The age of the solar system, taken to be close to 4.6 billion years, has been derived from measurements of radioactivity in meteorites, lunar samples, and Earths crust. Abundances of isotopes of uranium, thorium, and rubidium and their decay products, lead and strontium, are the measured quantities.

Assessment of the chemical composition of the solar system is based on data from Earth, the Moon, and meteorites as well as on the spectral analysis of light from the Sun and planets. In broad outline, the solar system abundances of the chemical elements decrease with increasing atomic weight. Hydrogen atoms are by far the most abundant, constituting 91 percent; helium is next, with 8.9 percent; and all other types of atoms together amount to only 0.1 percent.

The origin of Earth, the Moon, and the solar system as a whole is a problem that has not yet been settled in detail. The Sun probably formed by condensation of the central region of a large cloud of gas and dust, with the planets and other bodies of the solar system forming soon after, their composition strongly influenced by the temperature and pressure gradients in the evolving solar nebula. Less-volatile materials could condense into solids relatively close to the Sun to form the terrestrial planets. The abundant, volatile lighter elements could condense only at much greater distances to form the giant gas planets.

In the1990s astronomers confirmed that other stars have one or more planets revolving around them. Studies of these planetary systems have both supported and challenged astronomers theoretical models of how Earths solar system formed. Unlike the solar system, many extrasolar planetary systems have large gas giants like Jupiter orbiting very close to their stars, and in some cases these hot Jupiters are closer to their star than Mercury is to the Sun.

That so many gas giants, which form in the outer regions of their system, end up so close to their stars suggests that gas giants migrate and that such migration may have happened in the solar systems history. According to the Grand Tack hypothesis, Jupiter may have done so within a few million years of the solar systems formation. In this scenario, Jupiter is the first giant planet to form, at about 3 AU from the Sun. Drag from the protoplanetary disk causes it to fall inward to about 1.5 AU. However, by this time, Saturn begins to form at about 3 AU and captures Jupiter in a 3:2 resonance. (That is, for every three revolutions Jupiter makes, Saturn makes two.) The two planets migrate outward and clear away any material that would have gone to making Mars bigger. Mars should be bigger than Venus or Earth, but it is only half their size. The Grand Tack, in which Jupiter moves inward and then outward, explains Marss small size.

About 500 million years after the Grand Tack, according to the Nice Model (named after the French city where it was first proposed), after the four giant planetsJupiter, Saturn, Uranus, and Neptuneformed, they orbited 517 AU from the Sun. These planets were in a disk of smaller bodies called planetesimals and in orbital resonances with each other. About four billion years ago, gravitational interactions with the planetesimals increased the eccentricity of the planets orbits, driving them out of resonance. Saturn, Uranus and Neptune migrated outward, and Jupiter migrated slightly inward. (Uranus and Neptune may even have switched places.) This migration scattered the disk, causing the Late Heavy Bombardment. The final remnant of the disk became the Kuiper belt.

The origin of the planetary satellites is not entirely settled. As to the origin of the Moon, the opinion of astronomers long oscillated between theories that saw its origin and condensation as simultaneous with the formation of Earth and those that posited a separate origin for the Moon and its later capture by Earths gravitational field. Similarities and differences in abundances of the chemical elements and their isotopes on Earth and the Moon challenged each group of theories. Finally, in the 1980s a model emerged that gained the support of most lunar scientiststhat of a large impact on Earth and the expulsion of material that subsequently formed the Moon. (See Moon: Origin and evolution.) For the outer planets, with their multiple satellites, many very small and quite unlike one another, the picture is less clear. Some of these moons have relatively smooth icy surfaces, whereas others are heavily cratered; at least one, Jupiters Io, is volcanic. Some of the moons may have formed along with their parent planets, and others may have formed elsewhere and been captured.

The measurable quantities in stellar astrophysics include the externally observable features of the stars: distance, temperature, radiation spectrum and luminosity, composition (of the outer layers), diameter, mass, and variability in any of these. Theoretical astrophysicists use these observations to model the structure of stars and to devise theories for their formation and evolution. Positional information can be used for dynamical analysis, which yields estimates of stellar masses.

In a system dating back at least to the Greek astronomer-mathematician Hipparchus in the 2nd century bce, apparent stellar brightness (m) is measured in magnitudes. Magnitudes are now defined such that a first-magnitude star is 100 times brighter than a star of sixth magnitude. The human eye cannot see stars fainter than about sixth magnitude, but modern instruments used with large telescopes can record stars as faint as about 30th magnitude. By convention, the absolute magnitude (M) is defined as the magnitude that a star would appear to have if it were located at a standard distance of 10 parsecs. These quantities are related through the expression m M = 5 log10 r 5, in which r is the stars distance in parsecs.

The magnitude scale is anchored on a group of standard stars. An absolute measure of radiant power is luminosity, which is related to the absolute magnitude and usually expressed in ergs per second (ergs/sec). (Sometimes the luminosity is stated in terms of the solar luminosity, 3.86 1033 ergs/sec.) Luminosity can be calculated when m and r are known. Correction might be necessary for the interstellar absorption of starlight.

There are several methods for measuring a stars diameter. From the brightness and distance, the luminosity (L) can be calculated, and, from observations of the brightness at different wavelengths, the temperature (T) can be calculated. Because the radiation from many stars can be well approximated by a Planck blackbody spectrum (see Plancks radiation law), these measured quantities can be related through the expression L = 4R2T4, thus providing a means of calculating R, the stars radius. In this expression, is the Stefan-Boltzmann constant, 5.67 105 ergs/cm2K4sec, in which K is the temperature in kelvins. (The radius R refers to the stars photosphere, the region where the star becomes effectively opaque to outside observation.) Stellar angular diameters can be measured through interferometrythat is, the combining of several telescopes together to form a larger instrument that can resolve sizes smaller than those that an individual telescope can resolve. Alternatively, the intensity of the starlight can be monitored during occultation by the Moon, which produces diffraction fringes whose pattern depends on the angular diameter of the star. Stellar angular diameters of several milliarcseconds can be measured.

Many stars occur in binary systems (see binary star), in which the two partners orbit their mutual centre of mass. Such a system provides the best measurement of stellar masses. The period (P) of a binary system is related to the masses of the two stars (m1 and m2) and the orbital semimajor axis (mean radius; a) via Keplers third law: P2 = 42a3/G(m1 + m2). (G is the universal gravitational constant.) From diameters and masses, average values of the stellar density can be calculated and thence the central pressure. With the assumption of an equation of state, the central temperature can then be calculated. For example, in the Sun the central density is 158 grams per cubic cm; the pressure is calculated to be more than one billion times the pressure of Earths atmosphere at sea level and the temperature around 15 million K (27 million F). At this temperature, all atoms are ionized, and so the solar interior consists of a plasma, an ionized gas with hydrogen nuclei (i.e., protons), helium nuclei, and electrons as major constituents. A small fraction of the hydrogen nuclei possess sufficiently high speeds that, on colliding, their electrostatic repulsion is overcome, resulting in the formation, by means of a set of fusion reactions, of helium nuclei and a release of energy (see proton-proton cycle). Some of this energy is carried away by neutrinos, but most of it is carried by photons to the surface of the Sun to maintain its luminosity.

Other stars, both more and less massive than the Sun, have broadly similar structures, but the size, central pressure and temperature, and fusion rate are functions of the stars mass and composition. The stars and their internal fusion (and resulting luminosity) are held stable against collapse through a delicate balance between the inward pressure produced by gravitational attraction and the outward pressure supplied by the photons produced in the fusion reactions.

Stars that are in this condition of hydrostatic equilibrium are termed main-sequence stars, and they occupy a well-defined band on the Hertzsprung-Russell (H-R) diagram, in which luminosity is plotted against colour index or temperature. Spectral classification, based initially on the colour index, includes the major spectral types O, B, A, F, G, K and M, each subdivided into 10 parts (see star: Stellar spectra). Temperature is deduced from broadband spectral measurements in several standard wavelength intervals. Measurement of apparent magnitudes in two spectral regions, the B and V bands (centred on 4350 and 5550 angstroms, respectively), permits calculation of the colour index, CI = mB mV, from which the temperature can be calculated.

For a given temperature, there are stars that are much more luminous than main-sequence stars. Given the dependence of luminosity on the square of the radius and the fourth power of the temperature (R2T4 of the luminosity expression above), greater luminosity implies larger radius, and such stars are termed giant stars or supergiant stars. Conversely, stars with luminosities much less than those of main-sequence stars of the same temperature must be smaller and are termed white dwarf stars. Surface temperatures of white dwarfs typically range from 10,000 to 12,000 K (18,000 to 21,000 F), and they appear visually as white or blue-white.

The strength of spectral lines of the more abundant elements in a stars atmosphere allows additional subdivisions within a class. Thus, the Sun, a main-sequence star, is classified as G2 V, in which the V denotes main sequence. Betelgeuse, a red giant with a surface temperature about half that of the Sun but with a luminosity of about 10,000 solar units, is classified as M2 Iab. In this classification, the spectral type is M2, and the Iab indicates a giant, well above the main sequence on the H-R diagram.

The range of physically allowable masses for stars is very narrow. If the stars mass is too small, the central temperature will be too low to sustain fusion reactions. The theoretical minimum stellar mass is about 0.08 solar mass. An upper theoretical bound called the Eddington limit, of several hundred solar masses, has been suggested, but this value is not firmly defined. Stars as massive as this will have luminosities about one million times greater than that of the Sun.

A general model of star formation and evolution has been developed, and the major features seem to be established. A large cloud of gas and dust can contract under its own gravitational attraction if its temperature is sufficiently low. As gravitational energy is released, the contracting central material heats up until a point is reached at which the outward radiation pressure balances the inward gravitational pressure, and contraction ceases. Fusion reactions take over as the stars primary source of energy, and the star is then on the main sequence. The time to pass through these formative stages and onto the main sequence is less than 100 million years for a star with as much mass as the Sun. It takes longer for less massive stars and a much shorter time for those much more massive.

Once a star has reached its main-sequence stage, it evolves relatively slowly, fusing hydrogen nuclei in its core to form helium nuclei. Continued fusion not only releases the energy that is radiated but also results in nucleosynthesis, the production of heavier nuclei.

Stellar evolution has of necessity been followed through computer modeling, because the timescales for most stages are generally too extended for measurable changes to be observed, even over a period of many years. One exception is the supernova, the violently explosive finale of certain stars. Different types of supernovas can be distinguished by their spectral lines and by changes in luminosity during and after the outburst. In Type Ia, a white dwarf star attracts matter from a nearby companion; when the white dwarfs mass exceeds about 1.4 solar masses, the star implodes and is completely destroyed. Type II supernovas are not as luminous as Type Ia and are the final evolutionary stage of stars more massive than about eight solar masses. Type Ib and Ic supernovas are like Type II in that they are from the collapse of a massive star, but they do not retain their hydrogen envelope.

The nature of the final products of stellar evolution depends on stellar mass. Some stars pass through an unstable stage in which their dimensions, temperature, and luminosity change cyclically over periods of hours or days. These so-called Cepheid variables serve as standard candles for distance measurements (see above Determining astronomical distances). Some stars blow off their outer layers to produce planetary nebulas. The expanding material can be seen glowing in a thin shell as it disperses into the interstellar medium while the remnant core, initially with a surface temperature as high as 100,000 K (180,000 F), cools to become a white dwarf. The maximum stellar mass that can exist as a white dwarf is about 1.4 solar masses and is known as the Chandrasekhar limit. More-massive stars may end up as either neutron stars or black holes.

The average density of a white dwarf is calculated to exceed one million grams per cubic cm. Further compression is limited by a quantum condition called degeneracy (see degenerate gas), in which only certain energies are allowed for the electrons in the stars interior. Under sufficiently great pressure, the electrons are forced to combine with protons to form neutrons. The resulting neutron star will have a density in the range of 10141015 grams per cubic cm, comparable to the density within atomic nuclei. The behaviour of large masses having nuclear densities is not yet sufficiently understood to be able to set a limit on the maximum size of a neutron star, but it is thought to be less than three solar masses.

Still more-massive remnants of stellar evolution would have smaller dimensions and would be even denser that neutron stars. Such remnants are conceived to be black holes, objects so compact that no radiation can escape from within a characteristic distance called the Schwarzschild radius. This critical dimension is defined by Rs = 2GM/c2. (Rs is the Schwarzschild radius, G is the gravitational constant, M is the objects mass, and c is the speed of light.) For an object of three solar masses, the Schwarzschild radius would be about three kilometres. Radiation emitted from beyond the Schwarzschild radius can still escape and be detected.

Although no light can be detected coming from within a black hole, the presence of a black hole may be manifested through the effects of its gravitational field, as, for example, in a binary star system. If a black hole is paired with a normal visible star, it may pull matter from its companion toward itself. This matter is accelerated as it approaches the black hole and becomes so intensely heated that it radiates large amounts of X-rays from the periphery of the black hole before reaching the Schwarzschild radius. Some candidates for stellar black holes have been founde.g., the X-ray source Cygnus X-1. Each of them has an estimated mass clearly exceeding that allowable for a neutron star, a factor crucial in the identification of possible black holes. Supermassive black holes that do not originate as individual stars exist at the centre of active galaxies (see below Study of other galaxies and related phenomena). One such black hole, that at the center of the galaxy M87, has a mass 6.5 billion times that of the Sun and has been directly observed.

Whereas the existence of stellar black holes has been strongly indicated, the existence of neutron stars was confirmed in 1968 when they were identified with the then newly discovered pulsars, objects characterized by the emission of radiation at short and extremely regular intervals, generally between 1 and 1,000 pulses per second and stable to better than a part per billion. Pulsars are considered to be rotating neutron stars, remnants of some supernovas.

Stars are not distributed randomly throughout space. Many stars are in systems consisting of two or three members separated by less than 1,000 AU. On a larger scale, star clusters may contain many thousands of stars. Galaxies are much larger systems of stars and usually include clouds of gas and dust.

The solar system is located within the Milky Way Galaxy, close to its equatorial plane and about 8 kiloparsecs from the galactic centre. The galactic diameter is about 30 kiloparsecs, as indicated by luminous matter. There is evidence, however, for nonluminous matterso-called dark matterextending out nearly twice this distance. The entire system is rotating such that, at the position of the Sun, the orbital speed is about 220 km per second (almost 500,000 miles per hour) and a complete circuit takes roughly 240 million years. Application of Keplers third law leads to an estimate for the galactic mass of about 100 billion solar masses. The rotational velocity can be measured from the Doppler shifts observed in the 21-cm emission line of neutral hydrogen and the lines of millimetre wavelengths from various molecules, especially carbon monoxide. At great distances from the galactic centre, the rotational velocity does not drop off as expected but rather increases slightly. This behaviour appears to require a much larger galactic mass than can be accounted for by the known (luminous) matter. Additional evidence for the presence of dark matter comes from a variety of other observations. The nature and extent of the dark matter (or missing mass) constitutes one of todays major astronomical puzzles.

There are about 100 billion stars in the Milky Way Galaxy. Star concentrations within the galaxy fall into three types: open clusters, globular clusters, and associations (see star cluster). Open clusters lie primarily in the disk of the galaxy; most contain between 50 and 1,000 stars within a region no more than 10 parsecs in diameter. Stellar associations tend to have somewhat fewer stars; moreover, the constituent stars are not as closely grouped as those in the clusters and are for the most part hotter. Globular clusters, which are widely scattered around the galaxy, may extend up to about 100 parsecs in diameter and may have as many as a million stars. The importance to astronomers of globular clusters lies in their use as indicators of the age of the galaxy. Because massive stars evolve more rapidly than do smaller stars, the age of a cluster can be estimated from its H-R diagram. In a young cluster the main sequence will be well populated, but in an old cluster the heavier stars will have evolved away from the main sequence. The extent of the depopulation of the main sequence provides an index of age. In this way, the oldest globular clusters have been found to be about 12.5 billion years old, which should therefore be the minimum age for the galaxy.

The interstellar medium, composed primarily of gas and dust, occupies the regions between the stars. On average, it contains less than one atom in each cubic centimetre, with about 1 percent of its mass in the form of minute dust grains. The gas, mostly hydrogen, has been mapped by means of its 21-cm emission line. The gas also contains numerous molecules. Some of these have been detected by the visible-wavelength absorption lines that they impose on the spectra of more-distant stars, while others have been identified by their own emission lines at millimetre wavelengths. Many of the interstellar molecules are found in giant molecular clouds, wherein complex organic molecules have been discovered.

In the vicinity of a very hot O- or B-type star, the intensity of ultraviolet radiation is sufficiently high to ionize the surrounding hydrogen out to a distance as great as 100 parsecs to produce an H II region, known as a Strmgren sphere. Such regions are strong and characteristic emitters of radiation at radio wavelengths, and their dimensions are well calibrated in terms of the luminosity of the central star. Using radio interferometers, astronomers are able to measure the angular diameters of H II regions even in some external galaxies and can thereby deduce the great distances to those remote systems. This method can be used for distances up to about 30 megaparsecs. (For additional information on H II regions, see nebula: Diffuse nebulae (H II regions).)

Interstellar dust grains scatter and absorb starlight, the effect being roughly inversely proportional to wavelength from the infrared to the near ultraviolet. As a result, stellar spectra tend to be reddened. Absorption typically amounts to about one magnitude per kiloparsec but varies considerably in different directions. Some dusty regions contain silicate materials, identified by a broad absorption feature around a wavelength of 10 m. Other prominent spectral features in the infrared range have been sometimes, but not conclusively, attributed to graphite grains and polycyclic aromatic hydrocarbons (PAHs).

Starlight often shows a small degree of polarization (a few percent), with the effect increasing with stellar distance. This is attributed to the scattering of the starlight from dust grains that have been partially aligned in a weak interstellar magnetic field. The strength of this field is estimated to be a few microgauss, very close to the strength inferred from observations of nonthermal cosmic radio noise. This radio background has been identified as synchrotron radiation, emitted by cosmic-ray electrons traveling at nearly the speed of light and moving along curved paths in the interstellar magnetic field. The spectrum of the cosmic radio noise is close to what is calculated on the basis of measurements of the cosmic rays near Earth.

Cosmic rays constitute another component of the interstellar medium. Cosmic rays that are detected in the vicinity of Earth comprise high-speed nuclei and electrons. Individual particle energies, expressed in electron volts (eV; 1 eV = 1.6 1012 erg), range with decreasing numbers from about 106 eV to more than 1020 eV. Among the nuclei, hydrogen nuclei are the most plentiful at 86 percent, helium nuclei next at 13 percent, and all other nuclei together at about 1 percent. Electrons are about 2 percent as abundant as the nuclear component. (The relative numbers of different nuclei vary somewhat with kinetic energy, while the electron proportion is strongly energy-dependent.)

A minority of cosmic rays detected in Earths vicinity are produced in the Sun, especially at times of increased solar activity (as indicated by sunspots and solar flares). The origin of galactic cosmic rays has not yet been conclusively identified, but they are thought to be produced in stellar processes such as supernova explosions, perhaps with additional acceleration occurring in the interstellar regions. (For additional information on interstellar matter, see Milky Way Galaxy: The general interstellar medium.)

The central region of the Milky Way Galaxy is so heavily obscured by dust that direct observation has become possible only with the development of astronomy at nonvisual wavelengthsnamely, radio, infrared, and, more recently, X-ray and gamma-ray wavelengths. Together, these observations have revealed a nuclear region of intense activity, with a large number of separate sources of emission and a great deal of dust. Detection of gamma-ray emission at a line energy of 511,000 eV, which corresponds to the annihilation of electrons and positrons (the antimatter counterpart of electrons), along with radio mapping of a region no more than 20 AU across, points to a very compact and energetic source, designated Sagittarius A*, at the centre of the galaxy. Sagittarius A* is a supermassive black hole with a mass equivalent to 4,310,000 Suns.

Galaxies are normally classified into three principal types according to their appearance: spiral, elliptical, and irregular. Galactic diameters are typically in the tens of kiloparsecs and the distances between galaxies typically in megaparsecs.

Spiral galaxiesof which the Milky Way system is a characteristic exampletend to be flattened, roughly circular systems with their constituent stars strongly concentrated along spiral arms. These arms are thought to be produced by traveling density waves, which compress and expand the galactic material. Between the spiral arms exists a diffuse interstellar medium of gas and dust, mostly at very low temperatures (below 100 K [280 F, 170 C]). Spiral galaxies are typically a few kiloparsecs in thickness; they have a central bulge and taper gradually toward the outer edges.

Ellipticals show none of the spiral features but are more densely packed stellar systems. They range in shape from nearly spherical to very flattened and contain little interstellar matter. Irregular galaxies number only a few percent of all stellar systems and exhibit none of the regular features associated with spirals or ellipticals.

Properties vary considerably among the different types of galaxies. Spirals typically have masses in the range of a billion to a trillion solar masses, with ellipticals having values from 10 times smaller to 10 times larger and the irregulars generally 10100 times smaller. Visual galactic luminosities show similar spreads among the three types, but the irregulars tend to be less luminous. In contrast, at radio wavelengths the maximum luminosity for spirals is usually 100,000 times less than for ellipticals or irregulars.

Quasars are objects whose spectra display very large redshifts, thus implying (in accordance with the Hubble law) that they lie at the greatest distances (see above Determining astronomical distances). They were discovered in 1963 but remained enigmatic for many years. They appear as starlike (i.e., very compact) sources of radio waveshence their initial designation as quasi-stellar radio sources, a term later shortened to quasars. They are now considered to be the exceedingly luminous cores of distant galaxies. These energetic cores, which emit copious quantities of X-rays and gamma rays, are termed active galactic nuclei (AGN) and include the object Cygnus A and the nuclei of a class of galaxies called Seyfert galaxies. They are powered by the infall of matter into supermassive black holes.

The Milky Way Galaxy is one of the Local Group of galaxies, which contains about four dozen members and extends over a volume about two megaparsecs in diameter. Two of the closest members are the Magellanic Clouds, irregular galaxies about 50 kiloparsecs away. At about 740 kiloparsecs, the Andromeda Galaxy is one of the most distant in the Local Group. Some members of the group are moving toward the Milky Way system while others are traveling away from it. At greater distances, all galaxies are moving away from the Milky Way Galaxy. Their speeds (as determined from the redshifted wavelengths in their spectra) are generally proportional to their distances. The Hubble law relates these two quantities (see above Determining astronomical distances). In the absence of any other method, the Hubble law continues to be used for distance determinations to the farthest objectsthat is, galaxies and quasars for which redshifts can be measured.

Cosmology is the scientific study of the universe as a unified whole, from its earliest moments through its evolution to its ultimate fate. The currently accepted cosmological model is the big bang. In this picture, the expansion of the universe started in an intense explosion 13.8 billion years ago. In this primordial fireball, the temperature exceeded one trillion K, and most of the energy was in the form of radiation. As the expansion proceeded (accompanied by cooling), the role of the radiation diminished, and other physical processes dominated in turn. Thus, after about three minutes, the temperature had dropped to the one-billion-K range, making it possible for nuclear reactions of protons to take place and produce nuclei of deuterium and helium. (At the higher temperatures that prevailed earlier, these nuclei would have been promptly disrupted by high-energy photons.) With further expansion, the time between nuclear collisions had increased and the proportion of deuterium and helium nuclei had stabilized. After a few hundred thousand years, the temperature must have dropped sufficiently for electrons to remain attached to nuclei to constitute atoms. Galaxies are thought to have begun forming after a few million years, but this stage is very poorly understood. Star formation probably started much later, after at least a billion years, and the process continues today.

Observational support for this general model comes from several independent directions. The expansion has been documented by the redshifts observed in the spectra of galaxies. Furthermore, the radiation left over from the original fireball would have cooled with the expansion. Confirmation of this relic energy came in 1965 with one of the most striking cosmic discoveries of the 20th centurythe observation, at short radio wavelengths, of a widespread cosmic radiation corresponding to a temperature of almost 3 K (about 270 C [454 F]). The shape of the observed spectrum is an excellent fit with the theoretical Planck blackbody spectrum. (The present best value for this temperature is 2.735 K, but it is still called three-degree radiation or the cosmic microwave background.) The spectrum of this cosmic radio noise peaks at approximately a one-millimetre wavelength, which is in the far infrared, a difficult region to observe from Earth; however, the spectrum has been well mapped by the Cosmic Background Explorer (COBE), Wilkinson Microwave Anisotropy Probe, and Planck satellites. Additional support for the big bang theory comes from the observed cosmic abundances of deuterium and helium. Normal stellar nucleosynthesis cannot produce their measured quantities, which fit well with calculations of production during the early stages of the big bang.

Early surveys of the cosmic background radiation indicated that it is extremely uniform in all directions (isotropic). Calculations have shown that it is difficult to achieve this degree of isotropy unless there was a very early and rapid inflationary period before the expansion settled into its present mode. Nevertheless, the isotropy posed problems for models of galaxy formation. Galaxies originate from turbulent conditions that produce local fluctuations of density, toward which more matter would then be gravitationally attracted. Such density variations were difficult to reconcile with the isotropy required by observations of the 3 K radiation. This problem was solved when the COBE satellite was able to detect the minute fluctuations in the cosmic background from which the galaxies formed.

The very earliest stages of the big bang are less well understood. The conditions of temperature and pressure that prevailed prior to the first microsecond require the introduction of theoretical ideas of subatomic particle physics. Subatomic particles are usually studied in laboratories with giant accelerators, but the region of particle energies of potential significance to the question at hand lies beyond the range of accelerators currently available. Fortunately, some important conclusions can be drawn from the observed cosmic helium abundance, which is dependent on conditions in the early big bang. The observed helium abundance sets a limit on the number of families of certain types of subatomic particles that can exist.

The age of the universe can be calculated in several ways. Assuming the validity of the big bang model, one attempts to answer the question: How long has the universe been expanding in order to have reached its present size? The numbers relevant to calculating an answer are Hubbles constant (i.e., the current expansion rate), the density of matter in the universe, and the cosmological constant, which allows for change in the expansion rate. In 2003 a calculation based on a fresh determination of Hubbles constant yielded an age of 13.7 billion 200 million years, although the precise value depends on certain assumed details of the model used. Independent estimates of stellar ages have yielded values less than this, as would be expected, but other estimates, based on supernova distance measurements, have arrived at values of about 15 billion years, still consistent, within the errors. In the big bang model the age is proportional to the reciprocal of Hubbles constant, hence the importance of determining H as reliably as possible. For example, a value for H of 100 km/sec/Mpc would lead to an age less than that of many stars, a physically unacceptable result.

A small minority of astronomers have developed alternative cosmological theories that are seriously pursued. The overwhelming professional opinion, however, continues to support the big bang model.

Finally, there is the question of the future behaviour of the universe: Is it open? That is to say, will the expansion continue indefinitely? Or is it closed, such that the expansion will slow down and eventually reverse, resulting in contraction? (The final collapse of such a contracting universe is sometimes termed the big crunch.) The density of the universe seems to be at the critical density; that is, the universe is neither open nor closed but flat. So-called dark energy, a kind of repulsive force that is now believed to be a major component of the universe, appears to be the decisive factor in predictions of the long-term fate of the cosmos. If this energy is a cosmological constant (as proposed in 1917 by Albert Einstein to correct certain problems in his model of the universe), then the result would be a big chill. In this scenario, the universe would continue to expand, but its density would decrease. While old stars would burn out, new stars would no longer form. The universe would become cold and dark. The dark (nonluminous) matter component of the universe, whose composition remains unknown, is not considered sufficient to close the universe and cause it to collapse; it now appears to contribute only a fourth of the density needed for closure.

An additional factor in deciding the fate of the universe might be the mass of neutrinos. For decades the neutrino had been postulated to have zero mass, although there was no compelling theoretical reason for this to be so. From the observation of neutrinos generated in the Sun and other celestial sources such as supernovas, in cosmic-ray interactions with Earths atmosphere, and in particle accelerators, investigators have concluded that neutrinos have some mass, though only an extremely small fraction of the mass of an electron. Although there are vast numbers of neutrinos in the universe, the sum of such small neutrino masses appears insufficient to close the universe.

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astronomy | Definition & Facts | Britannica.com

Astronomy Picture of the Day

Astronomy Picture of the Day

Discover the cosmos!Each day a different image or photograph of our fascinating universe isfeatured, along with a brief explanation written by a professional astronomer.

2019 April 11

Explanation: What does a black hole look like?To find out, radio telescopes from around the Earth coordinated observations of black holes with the largest known event horizons on the sky. Alone, black holes are just black, but these monster attractors are known to be surrounded by glowing gas. The first image was released yesterday and resolved the area around the black hole at the center of galaxy M87 on a scale below that expected for its event horizon. Pictured, the dark central region is not the event horizon, but rather the black hole’s shadow — the central region of emitting gas darkened by the central black hole’s gravity.The size and shape of the shadow is determined by bright gas near the event horizon, by strong gravitational lensing deflections, and by the black hole’s spin. In resolving this black hole’s shadow, the Event Horizon Telescope (ETH) bolstered evidence that Einstein’s gravity works even in extreme regions, and gave clear evidence that M87 has a central spinning black hole of about 6 billion solar masses. The EHT is not done — future observations will be geared toward even higher resolution, better tracking of variability, and exploring the immediate vicinity of the black hole in the center of our Milky Way Galaxy.

Authors & editors: Robert Nemiroff(MTU) &Jerry Bonnell (UMCP)NASA Official: Phillip NewmanSpecific rights apply.NASA WebPrivacy Policy and Important NoticesA service of:ASD atNASA /GSFC& Michigan Tech. U.

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Astronomy | Definition of Astronomy by Merriam-Webster

The Difference Between Astronomy and Astrology

Some may find it easy to confuse astronomy and astrology. At one time, these two words actually were synonymous (that is, astronomy once meant what astrology means today), but they have since moved apart from each other. In current use, astronomy is concerned with the study of objects and matter outside the earth’s atmosphere, while astrology is the purported divination of how stars and planets influence our lives. Put bluntly, astronomy is a science, and astrology is not.

Middle English astronomie, from Anglo-French, from Latin astronomia, from Greek, from astr- + -nomia -nomy

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Astronomy | Definition of Astronomy by Merriam-Webster

Just 19 Percent of Americans Trust Self-Driving Cars With Kids

A new survey by AAA shows that most Americans distrust self-driving cars. In the past two years, public trust in the emerging technology has gone down.

Poor Turnout

While tech companies like Waymo, Uber, and Tesla race to be the first to build a fully-autonomous vehicle, the public is left eating their dust.

About 71 percent of Americans say that they don’t trust self-driving cars, according to a new American Automobile Association (AAA) survey. That’s roughly the same percentage as last year’s survey, but it’s eight points higher than in 2017, according to Bloomberg and just 19 percent say they’d put their children or family members into an autonomous vehicle.

Overall, the data is a striking sign of public fatigue with self-driving cars.

Track Record

Autonomous vehicles, unlike some other emerging technologies, have suffered very public setbacks, including when an Uber vehicle struck and killed a pedestrian a year ago.

“It’s possible that the sustained level of fear is rooted in a heightened focus, whether good or bad, on incidents involving these types of vehicles,” said AAA director of automotive engineering Greg Brannon in a statement obtained by Bloomberg. “Also it could simply be due to a fear of the unknown.”

Uphill Battle

The AAA survey found that Americans are more accepting of autonomous vehicle tech in limited-use cases. For example, 53 percent of survey respondents were okay with self-driving trams or shuttles being used in areas like theme parks, while 44 percent accepted the idea of autonomous food-delivery bots.

Self-driving car companies are currently engaging in public relations efforts to earn people’s trust, Bloomberg reports. But if these AAA numbers are any indication, there’s a long way to go.

READ MORE: Americans Still Fear Self-Driving Cars [Bloomberg]

More on autonomous vehicles: Exclusive: A Waymo One Rider’s Experiences Highlight Autonomous Rideshare’s Shortcomings

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Just 19 Percent of Americans Trust Self-Driving Cars With Kids

Elon Musk: $47,000 Model Y SUV “Will Ride Like a Sports Car”

A Familiar Car

First, it was supposed to feature Model-X-style “falcon wing” doors, and then it didn’t. It was supposed to be built in the Shanghai factory, but that didn’t work out either.

Tesla finally unveiled its fifth production car, the Model Y, at its design studio outside of Los Angeles Thursday evening.

“It has the functionality of an SUV, but it will ride like a sports car,” Tesla CEO Elon Musk said during the event. “So this thing will be really tight on corners.”

Bigger than the 3, Smaller Than the X

Yes, acceleration is still zippy: zero to 60 in 3.5 seconds.

But the vehicle is less than revolutionary. It’s arguably the company’s second crossover sports utility vehicle, after the Model X, and it borrows heavily from the company’s successful Model 3. In fact, 75 percent of its parts are the same, according to CEO Elon Musk.

The back of the Y is slightly elevated in the back for a roomier cargo space. A long-range model will feature seven seats — just like the Model X, despite being slightly smaller. Range: still 300 miles with the Long Range battery pack, thanks to its aerodynamic shape.

It will also be “feature complete” according to Musk, referring to the fact that the Model Y will one day be capable of “full self-driving” that he says “will be able to do basically anything just with software upgrades.”

10 Percent Cheaper

As expected, the Model Y is ten percent bigger and costs roughly ten percent more than the Model 3: the first Model Y — the Long Range model — will be released in the fall of 2020 and will sell for $47,000. A dual-motor all-wheel drive version and a performance version will sell for $51,000 and $60,000, respectively.

If you want to save a buck and get the ten-percent-cheaper-than-the-Model-3 version, you’ll have to wait: a Standard Range (230 miles) model will go on sale in 2021 for just $39,000.

Overall, the Model Y seems like a compromise: it’s not a radical shift, but it seems carefully designed to land with a certain type of consumer — and, if Musk is to be believed, without sacrificing Tesla’s carefully-cultivated “cool factor.”

Investors seemed slightly underwhelmed, too — the company’s stock reportedly slid up to five percent after the announcement.

READ MORE:  Tesla unveils Model Y electric SUV with 300 miles range and 7-seats [Electrek]

More on the Model Y: Elon Musk: Tesla Will Unveil Model Y Next Week

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Elon Musk: $47,000 Model Y SUV “Will Ride Like a Sports Car”

Special Announcement: Futurism Media and Singularity University

Futurism acquired by Singularity University

So, Readers –

As always, we’ve got some news about the future. Except this time, it’s about us.

We’re about to enter the next chapter of Futurism, one that will usher in a new era for this site. It’ll come with new ways we’ll be able to deliver on everything you’ve grown to read, watch, subscribe to, and love about what we do here. And also, more in volume of what we do, with larger ambitions, and ultimately, a higher level of quality with which we’re able to bring those ambitions to fruition.

As of today, Futurism Media is proud to announce that we’re joining operations with Singularity University. In other words: They bought us, they own us, and quite frankly, we’re excited about the deal.

It’s an excitement and an occasion we share in with you, our community of readers — aspiring and working technologists, scientists, engineers, academics, and fans, who carried us to where we are, who helped make this independent media company what it is today. We’ve always been humbled by your support, and we’ve worked to reciprocate it by publishing one of the most crucial independent technology and science digital digests, every day, full stop.

What this changes for you? Nothing. Really. Except: More of what you’ve come to count on Futurism.com to deliver every time you’ve read our stories, opened our emails, swiped up on our ‘Gram, watched our videos, dropped in on our events, clicked through a Byte, and so on. This partnership represents the sum total of the work you’ve engaged with, and the start of a new chapter in which we’ll be able to deliver on more of the above.

That means increased coverage of the emergent, cutting-edge innovation and scientific developments changing the world, and the key characters and narratives shaping them (or being shaped by them). It means an expanded, in-depth feature publishing program, arriving this Spring (it’s rad, and it’s gonna blow your socks off). It means more breaking news reporting and analysis. It means original media products you haven’t seen from us before — new verticals, microsites, other ways for you to get in the mix with our coverage. And yes, by working in concert with Singularity University, we’re going to have a pretty decent competitive advantage: Direct access to the characters and personas shaping our future, the people, ideas, and innovations right at the frontier of exponential growth technologies. Our branded content team, Futurism Creative, will also continue to produce guideline-abiding, cutting-edge, thoughtful and engaging content for our partners, and for the partners of SU, too. And finally, our Futurism Studios division will continue to push the envelope of feature-length narrative storytelling of the science fiction (and science fact) stories of that future.

Will this change our journalism? Not in the slightest. We’ll still be operating as an independent, objective news outlet, without interference from our partners, who will continue to hold us to the same ethics and accountability standards we’ve held ourselves to these last few years. There might be more appearances from the folks at SU in our work (not that SU’s proliferate network of notable alumni or board members haven’t previously made appearances around these parts prior to this), but by no means will SU be shoehorning themselves into what we do here.

Yet: Where the opportunity exists, we’ll absolutely seize on the chance to co-create and catalyze action together to shape the technology and science stories on the horizon, to say nothing of that future itself. We’ll continue to make quality the primary concern — and they’re here to support that mandate, and augment this team with additional resources to accomplish it. If even the appearance of a conflict presents itself, as always, we’ll default to disclosure. But it’d be absurd of us not to take advantage of the immense base of knowledge our new partners in Mountain View have on offer (an apt comparison here would be, say, Harvard Business Review to H.B.S. or M.I.T. and our contemporaries at the MIT Technology Review).

We’ve been circling this partnership for a while; they, fans of ours, and us, fans of theirs. The original mandate of Futurism as written by our C.E.O. Alex Klokus was to increase the rate of human adaptability towards the future through delivering on the news of where that future is headed. Singularity University concerns itself with educating the world on the exponential growth technologies changing our lives. It’s a perfect merging of interests. Where exponential growth technologies are concerned: One only need look as far as the way online advertising and social platforms changed the economics of media to see this. To find a home with a growing institution that will prove increasingly vital to the growing global community they’ve already established in spades is the best possible outcome. And no, we didn’t get crazy-rich or anything. But we did galvanize the future (and all its possibilities) for everyone at this company, and our ability to keep serving you, our readers.

We’re immensely proud of the scrappy, tight team here; and especially you, our community of readers and partners we’ve grown with these last few years. We’re proud of the product we’ve created, especially last year, when we steered away from reliance on social media platforms for an audience, and reconfigured an editorial strategy around the priority of driving you directly to Futurism.com daily, by prioritizing quality, topicality, reliability, and on-site presentation (shocker: it worked). Now, we proud to be able to do more, better, of what we’ve always done here:

Tell the stories of tomorrow, today. On behalf of the entire Brooklyn-based Futurism team, thanks for being along for the ride so far, and on behalf of the new Futurism x Singularity University family, here’s to more of where that came from.

The future, as ever, is looking bright. We can’t wait to tell you about it.

– Foster Kamer
Director of Content

James Del
Publisher

Sarah Marquart
Director of Strategic Operations

Geoff Clark
President of Futurism Studios

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Elon Musk: 2019 Will Be “the Year of the Solar Roof”

During the unveiling of Tesla's highly anticipated Model Y, CEO Elon Musk announced that the company would focus on its Solar Roof and Powerwall in 2019.

Looking Up

During the unveiling of Tesla’s highly anticipated Model Y Thursday night, CEO Elon Musk shared his vision for his company’s immediate future — and it had little to do with cars.

“This is definitely going to be the year of the Solar Roof and Powerwall,” he told the audience, according to Inverse — a sign that Tesla is shifting its focus from the road to the home, with the ultimate goal of creating a fully sustainable future.

Pretty Picture

In August 2017, Tesla gave the world its first glimpse of an installed Solar Roof, and it looked, well, a lot like any other roof. But that was the point — Tesla’s solar tiles didn’t have the jarring appearance of many home solar panels.

That aesthetically pleasing design — combined with the tiles’ affordability and “infinity warranty” — had solar energy expert Senthil Balasubramanian predicting Tesla would be a “game changer” for clean energy.

With the exception of the occasional massive battery project, though, we haven’t heard much about Tesla’s home energy products since then. The company spent much of 2017 and 2018 focused on getting through the Model 3’s “production hell” and dealing with the fallout from Musk’s latest public misstep.

Under One Roof

But now that Model 3 production is humming along, Tesla has the bandwidth to shift some of its engineering focus back to its Solar Roof and home batteries, according to Musk — and that should go a long way toward helping the company meet its ambitious goal of a more sustainable energy system.

“Solar plus battery plus electric vehicles, we have a fully sustainable future,” Musk told the audience Thursday. “That’s a future you can feel really excited and optimistic about. I think that really matters.”

READ MORE: Tesla Solar Roof: Elon Musk Declares 2019 Will Be the Year of the Roof [Inverse]

More on Tesla: Solar Expert Predicts Tesla Will Be a “Game-Changer” for Clean Energy

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Elon Musk: 2019 Will Be “the Year of the Solar Roof”

This Guy Spent a Whole Week In a VR Headset

Jak Wilmot, co-founder of Disrupt VR, an Atlanta-based VR content studio, spent 168 consecutive hours in a VR headset, locked up in his apartment.

The Dumbest Thing

Jak Wilmot, the co-founder of Atlanta-based VR content studioDisrupt VR, spent 168 consecutive hours in a VR headset — that’s a full week — pent up in his apartment.

“This is quite possibly the dumbest thing I’ve ever done, but welcome to a week in the future,” he said in a video about the experiment.

To make the experience even more futuristic, Wilmot livestreamed the entire week on Twitch late last month, later uploading a wrapup video on his entire week on YouTube.

The rules were simple: he could switch from a computer-based Oculus headset to a different, untethered headset for thirty seconds while his eyes were closed. His windows were blacked out, he said, so that his physical body didn’t have to rely on the daylight-dependent circadian rhythm.

His more mobile VR headset had a built in camera in the front, so that he was able to “see” his physical surroundings — but not directly with his own eyes.

“Everything is in the Headset”

Wilmot worked, ate and exercised inside virtual reality. Sleeping in the headset turned out to be “more comfortable” than Wilmot anticipated, though his eyes burned a bit.

“If one is feeling stressed, they can load into a natural environment for ten minutes and relax,” he said in the video. “If one is feeling energetic, they can dispel energy in a fitness game — these are like the new rules of the reality I’ve thrown myself in. Everything is in the headset.”

VR Connection

Wilmot believes that virtual reality is what you make it. If you want to be alone, you can spend time by yourself in a gaming session, slaying dragons in Skyrim VR. Or you can chose to join the cacophony of VRChat — a communal free-for-all multiplayer online platform that allows you to interact with avatars controlled by complete strangers.

“VR is stepping into the shoes of someone else, or stepping into a spaceship and talking to friends,” said Wilmot. “It’s very easy to find your tribe, to make friends, to communicate with others through a virtual landscape, where its no longer through digital window [like a monitor], but actually being there with them. To me that’s what VR is — connection.”

Escaping Virtual Reality

After seven days of living inside the headset, Wilmot took off the goggles and relearned what it’s like to live in the real world.

Experiment_01… ????????

Subject Status… ????? pic.twitter.com/HC0Jqb3aZq

— jak (@JakWilmot) February 27, 2019

Apart from slight dizziness and some disorientation, he came back to normal almost instantly.

One major advantage to not living inside a VR headset: “oh my gosh,” he said, “the graphics are so good.”

READ MORE: This Guy Is Spending A Full Week In VR, For Science [VR Scout]

More on virtual reality: Sex Researchers: For Many, Virtual Lovers Will Replace Humans

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This Guy Spent a Whole Week In a VR Headset

How Can We Build Cities to Accommodate 6.5 Billion People?

By 2050, 6.5 billion people will choose to live in cities. These individuals will require employment and access to better healthcare from an infrastructure that is already extremely vulnerable. The Global Maker Challenge asked makers and innovators to help put forward solutions for this issue, and they delivered.

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How Can We Build Cities to Accommodate 6.5 Billion People?

Samsung Is Working on Phone With “Invisible” Camera Behind Screen

A Samsung exec has shared new details on the company's efforts to create a full-screen phone, one with the camera embedded beneath the display.

Punch It

Just last month, South Korean tech giant Samsung unveiled the Galaxy S10, a phone with just a single hole punched in the screen to accommodate its front-facing camera.

On Thursday, a Samsung exec shared new details on the company’s intentions to create a “perfect full-screen” phone, with an “invisible” camera behind the screen to eliminate the need for any visible holes or sensors — confirming that one of the biggest players in tech sees edge-to-edge screens as the future of mobile devices.

Hidden Tech

During a press briefing covered by Yonhap News Agency, Samsung’s Mobile Communication R&D Group Display Vice President Yang Byung-duk said the company’s goal is to create a phone with a screen that covers the entire front of the device — but consumers shouldn’t expect it in the immediate future.

“Though it wouldn’t be possible to make (a full-screen smartphone) in the next 1-2 years,” Yang said, “the technology can move forward to the point where the camera hole will be invisible, while not affecting the camera’s function in any way.”

Quest for Perfection

This isn’t Samsung’s first mention of an uninterrupted full-screen phone — as pointed out by The Verge, the company discussed its ambitions to put the front-facing camera under a future device’s screen during a presentation in October.

That presentation included a few additional details on how the camera in a full-screen phone would work.

Essentially, the entire screen would serve as a display whenever the front-facing camera wasn’t in use. When in use, however, the screen would become transparent, allowing the camera to see through so you could snap the perfect selfie — and based on Yang’s comments, that new innovation could be just a few years away.

READ MORE: Samsung Seeks Shift to Full Screen in New Smartphones [Yonhap News Agency]

More on Samsung: Samsung Just Revealed a $1,980 Folding Smartphone

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Samsung Is Working on Phone With “Invisible” Camera Behind Screen

Slack Just Removed a Bunch of Hate Groups

Workplace messaging app Slack just announced that it banned 28 accounts that were known to be affiliated with hate groups.

Violating Terms

Slack, the team collaboration app commonly used to connect people within workplaces, announced Thursday that it had deleted 28 accounts that were clearly affiliated with hate groups, according to the company’s blog.

The announcement, sparse on concrete details or specifics, states that hate groups are explicitly unwelcome on the app and that Slack will continue to investigate and act on any future reports of hate speech or illegal activity.

“Today we removed 28 accounts because of their clear affiliation with known hate groups,” the statement reads. “The use of Slack by hate groups runs counter to everything we believe in at Slack and is not welcome on our platform.”

Joining the Fight

In recent years, major platforms like Facebook and Twitter have struggled to keep white supremacists and other hate groups from spreading their messages across the internet, though both ban Nazi messaging in Germany, where Holocaust denial is illegal.

Smaller scale platforms like Discord also recently started acting against hate groups, according to The Verge, which speculates that Slack’s focus on business communications instead of cultivating largescale communities may have helped the company avoid the issue of online hatemongering.

Real World Consequences

When hate speech is allowed to propagate online, it can lead to real-world violence — like the murder of Heather Heyer at a 2017 white supremacist rally. But banning hate groups and de-platforming the people behind them, as Slack claims to have done, is a successful strategy.

When right-wing activist Milo Yiannopolous was no longer permitted by online platforms to spread his racist and misogynistic viewpoints, he found himself effectively powerless and millions of dollars in debt, according to The Guardian.

“Using Slack to encourage or incite hatred and violence against groups or individuals because of who they are is antithetical to our values and the very purpose of Slack,” the company’s statement reads. “When we are made aware of an organization using Slack for illegal, harmful, or other prohibited purposes, we will investigate and take appropriate action and we are updating our terms of service to make that more explicit.”

READ MORE: Slack says it removed dozens of accounts affiliated with hate groups [The Verge]

More on content moderation: The UK Government Is Planning to Regulate Hate Speech Online

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Slack Just Removed a Bunch of Hate Groups

Presidential Hopeful Beto O’Rourke Belonged to Infamous Hacker Group

2020 Presidential hopeful Beto O'Rourke was reportedly part of the hacktivist group known as the Cult of the Dead Cow during his teenage years.

Political Hack

Presidential candidate Beto O’Rourke just admitted to spending his teenage years as part of the Cult of the Dead Cow (CDC), a group of hackers that first coined the term “hacktivism.”

O’Rourke, who failed to unseat Senator Ted Cruz in the 2018 midterm election and recently decided to run for president instead of challenging Senator John Cornyn in 2020, told Reuters that he credits the hacker group for helping develop his worldview — an intriguing admission for an unusual candidate who skateboards and used to play in a punk band.

Hacker-Lite

According to Reuters, there’s no evidence that O’Rourke actually engaged in any sort of serious hacking, though he did cop to stealing the long-distance phone service necessary for reaching the online message boards of the day.

Rather, O’Rourke seemed to spend his time in the Cult of the Dead Cow writing and sharing fiction with the community, such as a short story he wrote at age 15 about running over children in a car, Reuters reports.

“We weren’t deliberately looking for hacking chops,” CDC founder Kevin Wheeler told Reuters, describing the group’s attitude during the period of time O’Rourke was most active. “It was very much about personality and writing, really. For a long time, the ‘test,’ or evaluation, was to write [text files]. Everyone was expected to write things. If we were stoked to have more hacker-oriented people, it was because we’d be excited to have a broader range in our t-files.”

Formative Years

“There’s just this profound value in being able to be apart from the system and look at it critically and have fun while you’re doing it,” O’Rourke said. “I think of the Cult of the Dead Cow as a great example of that.”

The presidential hopeful, who espouses a mix of traditional liberal and libertarian views, describes the group as a sort of network for outcasts from society.

“When Dad bought an Apple IIe and a 300-baud modem and I started to get on boards, it was the Facebook of its day,” he said. “You just wanted to be part of a community.”

READ MORE: Beto O’Rourke’s secret membership in America’s oldest hacking group [Reuters]

More on hacktivism: It’s Now Scary to Be A White Hat Hacker Thanks to the US Government

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Presidential Hopeful Beto O’Rourke Belonged to Infamous Hacker Group

States Are Approving Cannabis to Fight Opioid Addiction

Risky Maneuver

So far, two U.S. states, New York and Illinois, have legalized the use of cannabis to help treat chronic pain as an alternative to addictive opioids.

Ask anyone on the street, and they would probably tell you that cannabis helps people chill out. The chemical similarities between cannabis and opioids make it seem, anecdotally, like cannabis could help reduce opioid addiction. Both drugs mitigate similar symptoms and usher in similar experiences – but cannabis is far less dangerous on its own.

But anecdotal evidence only goes so far.

Mixed Bag

While it’s hard to criticize something that could help alleviate the opioid epidemic, the physiological impact of treating either chronic pain or opioid addiction with cannabis hasn’t undergone nearly the same rigor of scientific study as other medical treatments, according to Scientific American.

Overall, scientists have faced many challenges when it comes to experimenting with cannabis. Though Scientific American reports that some clinical research is finally starting to support it, overall, there’s just not a lot of evidence backing up that anecdotal hunch.

But because other opioid addiction treatments like methadone already work, and because cutting people off of them can be dangerous, scientists argued that switching people already taking prescription opioids over to a prescription of cannabis could actually be dangerous in a perspective letter recently published to the Journal of the American Medical Association.

Pain Factor

The big question is whether cannabis will not only be able to help people already addicted to opioids, but also the chronic pain that the opioids may have been for in the first place.

In this case, research is once more limited. Plenty of studies suggest that cannabis treats pain, but a research paper published in European Archives of Psychiatry and Clinical Neuroscience earlier this year found that most cannabis pain studies had severe limitations, calling their findings into question.

Legalizing marijuana could help people find all sorts of new treatments. And while exploring new tools to help treat people affected by the opioid epidemic is commendable, cannabis likely won’t end up being the answer.

READ MORE: Can Cannabis Solve the Opioid Crisis? [Scientific American]

More on cannabis: New Senate Bill Would Legalize Marijuana Nationwide

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States Are Approving Cannabis to Fight Opioid Addiction

This Tech Could Secure Medical Implants Against Hackers

Many of today's medical implants communicate via Bluetooth, which makes them vulnerable to hacking, but a new system could change that.

Heart Hack

An implanted medical device can dramatically improve a person’s quality of life — or even save their life outright.

However, the devices come with serious security vulnerabilities, and it’s not hard to imagine the damage a person could do by hacking someone’s pacemaker, insulin pump, or brain implant.

Now, researchers from Purdue University have found a way to prevent hackers from intercepting the wireless signals used to communicate with implanted devices — and their creation could ensure the “internet of body” remains secure in the future.

Watch This

Many people monitor their implants via electronic devices, such as smart watches or smartphones, with the implants and devices communicating over Bluetooth.

Those wireless signals can extend as far as 10 meters away from a person’s body, according to the Purdue researchers – meaning someone in the vicinity of the implant owner could intercept the information — and perhaps manipulate it.

In a new paper published in the journal Scientific Reports, the researchers detail how they created a prototype watch that avoids this issue.

Short Leash

According to the researchers, their watch can receive a signal from anywhere on a person’s body, but instead of communicating over Bluetooth, the electrical signals travel through the person’s own body fluids to reach the watch, never extending more than one centimeter beyond the person’s skin.

As a bonus, the system also requires 100 times less energy than Bluetooth, according to the researchers — but its ability to protect incredibly sensitive communications could be reason enough for the technology to replace Bluetooth for implant applications in the future.

READ MORE: Your body is your internet – and now it can’t be hacked [Purdue University]

More on implants: New Brain Implant Could Translate Paralyzed People’s Thoughts Into Speech

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Here’s How Hackers Stole $15 Million From Mexican Banks

In April, bank hackers stole the equivalent of $20 million from Mexico's central bank thanks to a network rife with security flaws.

Ocean’s Once

In April 2018, hackers stole the equivalent of $15 million from Mexican banks — and now we know how they probably did it.

Penetration tester and security advisor Josu Loza was one of the experts called in to respond to the April heist, and on March 8 he presented his findings at the RSA Security conference in San Francisco.

Based on his analysis, Mexico’s central bank wasn’t doing nearly enough to protect its clients’ money — but other financial institutions could avoid the same fate if they’re willing to work together.

Easy Money

On Friday, Wired published a story detailing the information Loza shared with the audience at RSA’s conference. Based on his assessment, the success of the heist was due to a combination of expert bank hackers willing to spend months planning their crime and a banking network rife with security holes.

During the presentation, Loza made the case that the hackers might have accessed the Banco de México’s internal servers from the public internet, or perhaps launched phishing attacks on bank executives or employees to gain access.

Regardless of how they first got access, Loza said, the main problem was putting too many eggs in one security basket. Because many of the networks lacked adequate segmentation and access controls, he argued, a single breach could provide the bank hackers with extensive access.

That enabled them to lay the groundwork to eventually make numerous money transfers in smaller amounts, perhaps $5,000 or so, to accounts under their control. They’d then pay hundreds of “cash mules” each a small sum — Loza estimated that $260 might be enough — to withdraw the money for them.

Cyber Insecurity

The bank hackers are still at large, but the heist appears to have served as a wake-up call for the Banco de México.

“From last year to today the focus has been implementing controls. Control, control, control,” Lazo said during his presentation, according to Wired. “And I think the attacks aren’t happening today because of it.”

He also noted the need for companies to collaborate to defend against cyberattacks.

“Mexican people need to start to work together. All the institutions need to cooperate more,” Loza said. “The main problem on cybersecurity is that we don’t share knowledge and information or talk about attacks enough. People don’t want to make details about incidents public.”

READ MORE: HOW HACKERS PULLED OFF A $20 MILLION MEXICAN BANK HEIST [Wired]

More on hacking: Hacker Figures out How to Drain $1 Million in Cash From ATM

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New Robot Hand Works Like a Venus Flytrap to Grip Objects

A team from MIT and Harvard has created a robot hand that's not only strong, but also soft — and it could usher in a new era in robotics.

Versatile Touch

If we want robots to take over more tasks for humans, we need to give them more versatile hands.

Right now, many robot hands can only complete specialized tasks. Ones that are strong often have trouble with tasks that require a delicate touch, and soft hands often don’t pack much of a punch when it comes to strength.

But now, a team of researchers from the Massachusetts Institute of Technology (MIT) and Harvard University have created a robot hand that’s not only strong, but also soft — and it could usher in a new era in robotics.

Show of Hands

The team drew inspiration for its hand from the origami magic ball. Rather than using some sort of finger-like grippers, their cone-shaped robot hand envelopes an object and then collapses around it, much like a Venus flytrap captures its prey.

The pressure applied is enough for the hand to lift objects up to 100 times its own weight, but it can also handle far more delicate, light objects. A video released by MIT demonstrates the hand’s ability to pick up everything from a soup can to a banana.

Soft, but Strong

University of California at Santa Cruz robotics professor Michael Wehner, who was not involved in the project, praised the hand, noting its novelty in an interview with MIT News.

“This is a very clever device that uses the power of 3-D printing, a vacuum, and soft robotics to approach the problem of grasping in a whole new way,” Wehner said. “In the coming years, I could imagine seeing soft robots gentle and dexterous enough to pick a rose, yet strong enough to safely lift a hospital patient.”

READ MORE: Robot hand is soft and strong [MIT News]

More on robot hands: This AI-Operated Robotic Hand Moves With “Unprecedented Dexterity”

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