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How does a black hole get to the center of a galaxy, and does the galaxy revolve around it? – Astronomy Magazine

Posted: March 16, 2024 at 10:13 am

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There are three types of black holes, all born in different ways. But even the largest black holes cant dominate the rotation of a galaxy.

Credit: NASA/JPL-Caltech.

If a black hole begins as a star somewhere in a galaxy, how does it end up in the galaxys center? Is the gravitational pull so strong that all the stars in the galaxy start revolving around it?

Paul Simon Raleigh, North Carolina

The black hole created by a single stars death is called a stellar-mass black hole. These black holes have masses about two to 100 times that of the Sun. When a star explodes to create a stellar-mass black hole, it might give itself a little kick and start flying through space, but this kick is random and could send it inward, outward, or in any direction in 3D. So, these black holes dont tend to end up in a galaxys center unless the star that created them happened to be there.

The type of black hole thats sitting in the center of a galaxy is different. This is a supermassive black hole, or SMBH, and as its name implies its much heftier. SMBHs have masses of at least a million solar masses, up to several billion solar masses. The one in the center of the Milky Way is about 4.3 million solar masses, while the one in the center of the elliptical galaxy M87 is more like 6.5 billion solar masses.

SMBHs are not born the same way as stellar-mass black holes, nor do they seem to be typically made up of many smaller black holes all smooshed together. In fact, we dont entirely know how SMBHs are born, but we do believe they arise roughly around the same time a galaxy is assembling itself, and we know that the two evolve together over time. But while they can influence each other, the gravitational interactions between an SMBH and its host galaxy are very minor.

Just because the SMBH is sitting in the center of a galaxy doesnt mean all the stars are revolving around it. Even with its super-hefty mass, an SMBH may only account for some one-millionth the mass of the galaxy as a whole. Thats such a tiny fraction that the stars in the galaxy barely even know the SMBH is there, gravitationally speaking. Plus, the strength of gravity falls off incredibly quickly the farther you get from the black hole. So, only stars that are close to the black hole orbit it; the vast majority of stars in a galaxy orbit the center of mass of the galaxy as a whole, which is also in the center but is not actually the SMBH.

Alison Klesman Senior Editor

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How does a black hole get to the center of a galaxy, and does the galaxy revolve around it? - Astronomy Magazine

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The eclipse gives astronomy clubs an opportunity to shine – Voice Of Alexandria

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Alexandria, MN (56308) Today

A mix of clouds and sun with gusty winds. High 37F. Winds NW at 20 to 30 mph. Higher wind gusts possible..

Partly cloudy. Gusty winds diminishing after midnight. Low 16F. Winds NNW at 20 to 30 mph.

Updated: March 16, 2024 @ 8:07 am

KU Department of Physics & Astronomy professor receives prestigious NSF award for black hole research – Salina Post

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Sunset photo. Image courtesy University of Kansas News Service

ByRANJIT ARAB University of Kansas News Service

A prestigious Faculty Early Career Development (CAREER) Award from the National Science Foundation will help a University of Kansas Department of Physics & Astronomy professor continue her groundbreaking research on supermassive black holes.

Elisabeth Mills, assistant professor of physics & astronomy, received the five-year, $821,724 grant from the NSF for her research on how supermassive black holes grow.

Every galaxy, including our own Milky Way galaxy, has a supermassive black hole at its center, yet very little is known about how black holes gather gas from their surroundings to grow bigger. Mills will use some of the worlds most powerful telescopes the Very Large Array in New Mexico and the Atacama Large Millimeter/submillimeter Array in Chile to observe supermassive black holes in neighboring galaxies.

She said the goal is to study the gas and dust in the centers of these galaxies to better understand when they might become the next meal for the black holes.

This work helps us understand how our own Milky Way galaxy has been formed and how the growth of its black hole might change our galaxy in the future, Mills said.

The NSFs CAREER Award is the most prestigious awards given to faculty members beginning their independent careers, providing support to advance outstanding research through commitment to teaching, learning and disseminating knowledge. Along with helping to develop her research, Mills said the award will also support department outreach efforts, like the popular KU AstroNights telescope viewing events, as well as provide important opportunities for KU students.

It gives students in my group the opportunity to make connections with internationally renowned astronomers from all over the world and makes KU visible on an international stage, she said.

Arash Mafi, executive dean of KUs College of Liberal Arts & Sciences, said the award is a reflection of the high caliber of research taking place within the College.

We are thrilled that the NSF has recognized Professor Mills innovative work, Mafi said. It is further proof of the world-class research being conducted across the College of Liberal Arts & Sciences.

READ MORE:Suspect steals credit card machine and breaks window at The Mattress Hub

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KU Department of Physics & Astronomy professor receives prestigious NSF award for black hole research - Salina Post

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AI ‘for all’: How access to new models is advancing academic research, from astronomy to education – Source – Microsoft

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In early 2023, Professor Alice Oh and her colleagues at the Korea Advanced Institute of Science and Technology (KAIST) realized they needed to address the quickly growing interest in OpenAI ChatGPT among KAISTs students.

ChatGPT a tool developed by OpenAI that runs on large language models and generates conversational responses based on peoples prompts could lead to students taking shortcuts in their work but might also offer educational benefits, they reasoned. The group wanted to develop a research project that would engage students in using the technology, so they began thinking about how to develop their own chat application.

We were in a hurry, says Oh, a professor in the KAIST School of Computing. Our semester started in March, and we wanted to have students start using this right away when the semester started.

A solution soon emerged. In April 2023, Microsoft Research launched an initiative that aims to accelerate the development and use of foundation models large-scale AI models trained on vast amounts of data that can be used for a wide range of tasks.

Advancing Foundation Models Research (AFMR) provides academic researchers with access to state-of-the-art foundation models through Azure AI Services, with the goal of fostering a global AI research community and offering robust, trustworthy models that help further research in disciplines ranging from scientific discovery and education to healthcare, multicultural empowerment, legal work and design.

The initiatives grant program includes 200 projects at universities in 15 countries, spanning a broad range of focus areas. Researchers at Bostons Northeastern University are working on an AI-powered assistant designed to appear empathetic toward workers well-being. At Ho Chi Minh City University of Technology in Vietnam, researchers plan to create a fine-tuned large language model (LLM) specifically for Vietnamese. In Canada, researchers at the Universit de Montral are exploring how LLMs could help with molecular design and the discovery of new drugs.

Accessing foundation models can be challenging for academic researchers, who must often wait to use shared resources that can lack the computing power needed to run large models. Microsoft Research created the initiative to give researchers access to a range of powerful foundation models available through Azure and ensure that the development of AI is driven not just by industry, but also by the academic research community.

We realized that to develop AI today, there is really a need for industry to open up capacity for academia, says Evelyne Viegas, senior director of Research Catalyst at Microsoft Research. Those different viewpoints could shape what were doing.

With access to Azure OpenAI Service, which combines cutting-edge models from OpenAI with security, privacy and responsible AI protections offered in Azure, Oh and the KAIST team developed a platform that uses the models underlying ChatGPT for a chatbot to help college students write essays for English as a Foreign Language (EFL) courses. Students often write at night, when guidance from professors or teaching assistants isnt available, Oh says, and EFL students frequently use tools to help navigate the challenges of writing in English.

Ohs team designed the chatbot to answer students questions but not write their essays for them. Over a semester, 213 EFL students used the tool to refine their essays; the platform collected the students questions and essay revisions they made based on the chatbots responses, then Ohs team analyzed the data and published a paper about the experiment.

The researchers found that some students used the platform extensively and incorporated the feedback it provided. Many treated the chatbot like an intelligent peer, Oh says, suggesting that the technology can be a helpful complement to classroom instruction. And since the platform uses GPT-4, a large multimodal model developed by OpenAI that can communicate in multiple languages, students sometimes switched between English and their native language when using the platform, enabling more natural interactions.

The KAIST team plans to expand the platform to creative writing and conversational English classes. Oh sees tremendous potential for generative AI in education, particularly if models can be trained to show students how to reason through problems rather than simply providing answers.

Universities should take full advantage of this and really start to think about how we can use these tools for scientific research and education, she says.

Researchers at North Carolina Agricultural and Technical State University, who received a grant under the Microsoft program, are developing an AI-based traffic monitoring system capable of identifying road congestion and safety hazards. The project is aimed at automating much of the manual work required by traditional traffic monitoring systems.

The researchers used GPT-4 alongside other AI models that rely on traffic data collected by the federal government to analyze traffic patterns and congestion. Users interact with the system through a chatbot and can ask questions about current traffic conditions like how busy traffic is at a particular location or the speed at which vehicles are traveling.

It will make traffic management easier and more efficient, says Tewodros Gebre, a Ph.D. student working on the project.

The system uses GPT-4 to interpret traffic data collected from sensors, drones and GPS, allowing transportation agencies, city planners and citizens who arent necessarily data scientists to quickly get information about traffic conditions through the chat application.

We talk about data equity, and this combination with the chatbot makes the system available to people without them needing to go to this complex model and see whats going on, says Leila Hashemi-Beni, an associate professor in geospatial and remote sensing at the university. People with different skill sets can still get the information they need from this system.

The system, which is still in development, could also help identify the best evacuation routes after a natural disaster, she says.

Its not just transportation. This project has much bigger, broader impact. It gives us the opportunity for cutting-edge research that is very helpful to us as researchers and educators.

A collaboration between astronomers at Harvard University and The Australian National University is leveraging GPT-4 in a different way. Seeking to use LLMs to accelerate astronomy research, the group, called UniverseTBD, developed an astronomy-based chat application that draws from more than 300,000 astronomy papers.

Alyssa Goodman, the Robert Wheeler Wilson Professor of Applied Astronomy at Harvard, says the application could eventually help young astronomers extract key information from academic papers and analyze data to develop their own research and theories.

If you have a really good idea, its very hard to just search the literature and try to find everything, Goodman says. This is sort of like having a super adviser, a brilliant astronomer with an encyclopedic memory who can say, Well, that could be a very good idea and heres why, or Thats likely a bad idea and heres why.

The researchers hope to develop smaller language models for astronomy that will be accessible to astronomers of all levels, says Ioana Ciuc, the Jubilee Joint Fellow at The Australian National University leading UniverseTBD with Sandor Kruk, a data scientist at the European Space Agency, and Kartheik Iyer, a NASA Hubble Fellow at Columbia University.

Our mission is to democratize science for everyone, she says. GPT-4 is a very large language model and it runs on a lot of resources. In our pursuit of democratizing access, we want to build smaller models that learn from GPT-4 and can also learn to speak the language of astronomy better than GPT-4. Thats what were envisioning.

Many of the AFMR research projects focus on using LLMs for a range of societal benefits, from leveraging generative AI to assess pandemic risk to using vision and language models to help people who are blind or have low vision navigate outdoors.

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AI 'for all': How access to new models is advancing academic research, from astronomy to education - Source - Microsoft

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Inspect impressive Mare Imbrium Astronomy Now – Astronomy Now Online

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The Imbrium Basin is the largest impact basin on the Moons near side, with a diameter of around 1,160 kilometres. The South Pole-Aitken Basin on the far side is twice as large. The massive impact event that formed Imbrium, one of the most violent in the history of the Solar System that occurred 3.85 billion years ago, left a giant crater which was subsequently infilled by basaltic lava.

Mare Imbrium (Sea of Rains), the huge lava plain that we see today in the Moons north-western quadrant, is the most obvious legacy of that ancient, cataclysmic event. Second only in size to neighbouring Oceanus Procellarum (Ocean of Storms), Mare Imbrium is obvious to the naked eye on a 10 day-old gibbous Moon; indeed, Imbrium forms the left eye of the famous Man in the Moon feature. Raise a pair of binoculars or train a small telescope on Imbrium and it shouldnt take long to realise that Mare Imbrium is bordered by a number of very impressive mountain ranges.

The most striking range is Montes Apenninus (the lunar Apennines), which majestically guard the south-eastern shore of Mare Imbrium. They sweep in a 600-kilometres arc from Promontorium Fresnel in the north to the peaks east of crater Eratosthenes. Montes Apenninus highest peaks include the impressive Mons Huygens (5,500 metres), the highest peak on the Moon, and Mons Hadley (4,600 metres), lying close to its eastern extremities. A 150200m (six- to eight-inch) telescope, operating at a power of around 150 to 200, zooms in nicely on Mons Huygens and just to its west Mons Ampre (3,000 metres).

Montes Caucasus, to the east of Mare Imbrium, form a continuation of Montes Apenninus to the north-east (as far as crater Eudoxus). A third major range is Montes Carpatus (Carpathian Mountains), found just north of the mighty Copernicus impact crater, that mark the southern border of Imbrium. Together, Apenninus, Caucasus and Carpatus form the outermost of Imbriums three concentric rings of mountains, part of what is left of the rim of the basin following the lava flooding.

Montes Alpes (the Alpes Mountains), in the northeastern portion of the Imbrium Basin, is another famous feature thats easily located as a rugged 250-kilometre-long south-east arc sweeping from the dark-floored crater Plato to crater Cassini. Look out for the striking Vallis Alpes, a rift valley that cuts right through the Alpine range

Through binoculars its easy to see that at its southern extremities Montes Alpes lies just inside the western flanks of Montes Caucasus. This is because Montes Alpes was part of middle ring of the Imbrium basin.

Youre no doubt familiar with the Straight Wall (Rupes Recta), the 110-kilometre-long linear fault in the south-eastern part of Mare Nubian. How about Montes Recti, the Straight Range? It is an east-west orientated rectangular formation of peaks, around 90 kilometres in length and just 20 kilometres wide.

Individual peaks and groups of peaks, including Montes Recti, are common close to the north shore of Mare Imbrium. Lying just to the east of Montes Recti is the better known range Montes Teneriffe and to the south of Plato is the isolated peak Mons Pico, which towers 2,400 metres or so above the plain. Close by to the south-east is Mons Piton (2,300 metres), another stand-alone massif. However, they only seem to be individual peaks as they are easily-observable traces of an inner ring some 790 kilometres in diameter, parts of the inner terracing of the basin that were high enough not to be drowned by lava that formed the mare surface.

Further inspection southwards reveal more evidence of the inner-ring; Montes Spitzbergen (Spitzbergen Mountains) is located about 80 kilometres north of impact crater Archimedes.

The west to north-western section of the Imbrium Basin lack anything like as substantial a mountain range, but the vast semicircular scarp of Montes Jura, bordering Sinus Iridum (Bay of Rainbows) indented in the north-western edge of Mare Imbrium, is a magnificent sight.

There are a handful of outstanding craters seen in the encircling mountains and standing in splendid isolation on the Imbrium plain.

The flooded crater Archimedes (81km) is the best and most prominent impact crater seen on the floor of the Mare Imbrium, at its eastern edge. Together with close companions Aristillus (55km) and Autolycus (39km), lying east and north-east, respectively, the trio provide a great sight. Looking through a small telescope, Archimedes has a smooth, Plato-like dark floor, which contrasts nicely with the marvellous central peaks of Aristillus.

Cassini is a curious crater lying to the north-east of Aristillus. Like Archimedes its a flooded crater, but its floor contains the interior craters Cassini A and Cassini B, the former having an unusual floor. Archimedes and companions and Cassini are all on show on the morning of 17 October.

Crater Eratosthenes (60km)lies in the foothills of south-western Montes Apenninus (Apennines). It hasasharprimwithwideinternallyterracedwallsandahillyfloor,abovewhichrisesagroupof mountains. Many observers liken it to a mini-Copernicus. Before you finish observing Imbrium, be sure to take a look at dark-floored Plato, lying at the western end of Montes Alpes.

Crater Lambert (30km) lies in glorious isolation on the Imbrium plane, around 350 kilometres west of Archimedes. Lambert is an easy target for any telescope but can you spot larger Lambert R (Ruin; 56km) lying just to the south? It is one of the Moons many ghost craters. Astronomers believe it is an impact crater that was subsequently flooded by massive lava flows, left behind its rim as evidence of its former existence.

Now head to Imbriums far south-eastern quadrant, around 100 kilometres north-east of crater Eratosthenes, to track down a little ghost crater called Wallace (26km). Both craters are much easier to spot when they are illuminated by a low Sun.

Who can forget when in 1994 over 20 fragments of Comet ShoemakerLevy 9 dubbed string of pearls slammed into Jupiters cloud-tops, producing a series of dark scars on the planets southern hemisphere, the largest of which persisted for months. The comet was torn apart by Jupiters overwhelming tidal forces Astronomers believe similar impacts have occurred on the Moon and, unlike Jupiters long-dispersed scaring, we can observe the results. Perhaps the most famous of such features on the Moon is Cantena Davy, lying between crater Davy and majestic Ptolemaeus. However, there are a couple of them worthy of attention in the Imbrium Basin.

The small impact crater Beer (10km) lies around 115 kilometres south-west of the large crater Archimedes (80km). Astronomers think multiple impacts from a single, disrupted body, a comet or an asteroid, formed the chain of tiny craters (Cantena Beer; the largest crater is about 1.5 kilometres in diameter) seen arcing eastwards from Beer, eventually turning into a straight rille. Youll need a telescope on the 250mm (10-inch) class to spot them, though Beer itself is an easy capture.

Crater Timocharis (34km) lies about 90 kilometres south-east of Beer. Lying just south-west of Timocharis are two much smaller craters, Heinrich (6km), the larger of the pair, with Timoocharis-C due east. Running north-north-eastwards from Timocharis-C is Cantena Timocharis, a 20-kilometre-long string of diminutive craters. This feature is probably best left to high-resolution imagers, though a large Dobsonian on a steady night could be successful. Try for Cantenae Beer and Timocharis on the morning

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The Sky This Week from March 15 to 22: A conjunction of Venus and Saturn – Astronomy Magazine

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On March 21, spotting Saturn before sunrise will be a challenge but you can use bright Venus nearby as a guide. Credit: Astronomy: Roen Kelly

Friday, March 15 The waxing Moon sits in Taurus the Bull this evening, slowly sinking in the west after sunset. Luna hangs over the Pleiades (M45), a sparkling cluster of young stars that many observers can easily pick out with the naked eye. To the Moons lower left is magnitude 0.9 Aldebaran, a red giant star that marks Taurus eye.

Also in Taurus this month is asteroid 4 Vesta, heading slowly toward the feet of Gemini. Glowing around 8th magnitude, Vesta should be an easy catch with binoculars or a small scope, even under suburban skies. Find it tonight about 3.2 north-northeast of Zeta () Tauri. This 3rd-magnitude star marks the tip of the Bulls southeastern horn. Slightly northwest of it is brighter, 2nd-magnitude Elnath (Beta [] Tau, but also historically cataloged as Gamma [] Aurigae), which marks the tip of Taurus other horn.

Vesta is just under 3 northeast of M1 tonight, also known as the Crab Nebula. Observers with larger scopes and good skies can try spying this fuzzy, 8th-magnitude supernova remnant once twilight fades, though the nearby Moon may make the elusive target a little harder than usual to spot.

Sunrise: 7:11 A.M. Sunset: 7:08 P.M. Moonrise: 10:08 A.M. Moonset: 12:48 A.M. Moon Phase: Waxing crescent (35%) *Times for sunrise, sunset, moonrise, and moonset are given in local time from 40 N 90 W. The Moons illumination is given at 12 P.M. local time from the same location.

Saturday, March 16 With the Moon reaching First Quarter tonight (shortly after midnight EDT, late on the 16th for all other time zones), lets turn our gaze toward our satellite specifically, the rugged terrain in the lunar south.

Tonight, our telescopic target is the 70-mile-wide (113 kilometers) crater Maurolycus, which you can use the map above to locate. This complex crater hosts a cluster of central peaks a common characteristic of impact craters which form as the newly excavated crater slumps back on itself due to gravity, piling material up in the center even as the material beneath the crater floor is also rebounding from the impact, further pressing the peaks upward.

But thats not the only sign of upheaval in the area. Maurolycus also features several craterlets along its floor, as well as a batch of craters carved into its northwestern rim. Take a look at the latter can you tell the order in which they were made, based on the way they overlap each other and the edge of larger Maurolycus?

Sunrise: 7:09 A.M. Sunset: 7:09 P.M. Moonrise: 10:53 A.M. Moonset: 1:59 A.M. Moon Phase: Waxing crescent (45%)

Sunday, March 17 First Quarter Moon occurs at 12:11 A.M. EDT, late on the 16th for all time zones farther west.

Rising in the east after sunset is the constellation Leo the Lion, looking as though the great cat is heading upward in the sky. Look for the famous Sickle asterism, which frames the Lions head and looks to many observers like a backwards question mark. The Sickle starts at Leos heart, magnitude 1.4 Regulus, which connects to Eta () Leonis to form the straight handle of the tool. From there, the blade curves around in a clockwise fashion, to Gamma, Zeta, Mu (), and finally Epsilon () Leo.

Keep watching as the hours pass and youll see Virgo start to climb above the eastern horizon as well, following Leo. This constellations Gamma star, also called Porrima, is a beautiful double star with an orbital period of 169 years. The stars last came closest in the early 2000s and are slowly growing farther apart, making them ever easier to split. They are now a bit more than 4 apart and can be spotted as separate suns under magnifications of about 100x.

Neptune is in conjunction with the Sun at 7 A.M. EDT, hence why the distant ice giant is not visible this month.

Sunrise: 7:07 A.M. Sunset: 7:10 P.M. Moonrise: 11:47 A.M. Moonset: 3:02 A.M. Moon Phase: Waxing gibbous (56%)

Monday, March 18 Want to see a strange trick of the solar systems geometry? Tonight, turn your telescope on the bright planet Jupiter as soon as youre able after sunset. The giant planet hangs in the west, about 40 high 20 minutes after the Sun disappears.

Three of Jupiters Galilean moons Europa, Io, and Ganymede lie far west of the planet. But the fourth, Callisto, is trekking from west to east north of the gas giant, passing over its pole with several arcseconds of clearance!

Whats going on? The Galilean moons orbit Jupiter in the same plane, just as the planets orbit the Sun. That plane is roughly aligned with Jupiters equator. But, due to the changing angle at which we see Jupiter from Earth, sometimes that plane doesnt align with the plane of the moons orbits! So, depending on the angle at which were viewing the Jupiter system from here on Earth, Callisto the farthest out of the Galilean moons can seem to skim or miss the planets poles altogether as it orbits.

Check out the moons to Jupiters west as well. Early in the night, Europa is farthest out, then Io just west of Ganymede, which is closest in. But around 10 P.M. CDT, as the planet is setting on the East Coast, Io passes Ganymede as the former moves eastward and the latter moves westward. After that, Io is closer to the planet than Ganymede.

Sunrise: 7:06 A.M. Sunset: 7:11 P.M. Moonrise: 12:45 P.M. Moonset: 3:55 A.M. Moon Phase: Waxing gibbous (65%)

Tuesday, March 19 The vernal equinox occurs today at 11:06 P.M. EDT, bringing the official start of spring to the Northern Hemisphere. The vernal equinox occurs when the Suns northward path through the sky, the ecliptic, crosses the celestial equator, which is a projection of Earths equator outward into the celestial sphere of the sky.

What better way to celebrate spring than to look for the Spring Triangle in the sky? This asterism is anchored by three bright, well-known stars, rising in the east in the early-evening hours: Arcturus (Alpha [] Botis, magnitude 0), Spica (Alpha Virginis, magnitude 1), and Denebola (Beta Leonis, magnitude 2).By 10 P.M. local daylight time, the Spring Triangle is well above the eastern horizon.

Ready for more spring-themed targets in the sky? Look farther west along the ecliptic, to the upper right of Leo, and youll spot Cancer the Crab. At the center of this constellation lies M44, also known as the Beehive Cluster. For some, this is a fuzzy naked-eye object; for all, though, binoculars or a telescope will bring out a stunning set of young stars, at least 80 of which are brighter than 10th magnitude. The Beehive shines with a total magnitude of about 3.7 and spans nearly 100 on the sky, slightly smaller than the Pleiades.

Sunrise: 7:04 A.M. Sunset: 7:12 P.M. Moonrise: 1:48 P.M. Moonset: 4:39 A.M. Moon Phase: Waxing gibbous (74%)

Wednesday, March 20 Comet 12P/Pons-Brooks is on the rise but also falling fast! Its brightening glow, now roughly around magnitude 5, is offset by its sinking altitude in the sky after sunset. But its worth seeking out for those observers who are quick about it.

Youll find Pons-Brooks about 25 high in the west some 30 minutes after sunset. Its in Andromeda, having recently passed the constellations eponymous galaxy. Together with Mercury (magnitude 7 and 10 high in Pisces) and Jupiter (magnitude 2.1 and 35 high in Aries), Pons-Brooks forms a triangle or arrow pointing to the right (north), with the comet at the northward-facing point. As the sky darkens, you can use magnitude 2.1 Mirach (Beta Andromedae) as a signpost Pons-Brooks lies about 7 south of this star.

The so-called Devil Comet (for its appearance during early outbursts) is fast approaching perihelion, when it passes closest to the Sun. As it does, it should continue to brighten, though astronomers arent sure how much. Many are hopeful it will reach easy naked-eye magnitude, earning it a spot as a great comet. Well have to wait and see, but for now, its easily viewed with binoculars or any small scope for as long as you can catch it before it sinks too close to the horizon within two to three hours after sunset. Note, too, that the waxing Moon is shedding plenty of light over the sky, somewhat affecting visibility even after twilight. Fortunately, the comet is bright enough now that it shouldnt matter much.

Sunrise: 7:03 A.M. Sunset: 7:13 P.M. Moonrise: 2:52 P.M. Moonset: 5:14 A.M. Moon Phase: Waxing gibbous (82%)

Thursday, March 21 Its always a magnificent treat to see two planets at once in your eyepiece, and this morning offers that chance. Venus and Saturn stand just 0.6 apart in the early-morning sky today, readily visible together in binoculars or any telescope. Note, though, that this observation is a bit tricky, because the planets are also only 2.5 above the horizon a mere 20 minutes before sunrise.

Fortunately, Venus is bright and easy to find, a blazing magnitude 3.9 point of light thats readily visible even in the growing twilight. Saturn is much dimmer, just magnitude 1 as it sits to Venus east (lower left) this morning.

Once youve got the pair of planets in your sights, take the chance to compare and contrast them. Venus appears 11 across and nearly 94 percent lit. Saturns disk is some 16 across and fully illuminated by the Sun. The giant planets stunning rings are about 35 across and tilted by about 5. And about 13 west of the pair is a third planet magnitude 1.3 Mars. See if you can spot it, too, by sliding your gaze west along the ecliptic, to the upper right of the planetary pairing in the sky.

Take care when making this observation of course its mesmerizing, but youll want to put away your optics at least several minutes before sunrise from your location, which may differ from the time given below.

Venus will pass 0.3 north of Saturn at 10 P.M. EDT. If you catch the pair again tomorrow morning, the brighter planet will appear northeast of Saturn, putting it on the other side (left) of the ringed planet. The planets will be about 0.7 apart then.

Sunrise: 7:01 A.M. Sunset: 7:14 P.M. Moonrise: 3:55 P.M. Moonset: 5:43 A.M. Moon Phase: Waxing gibbous (89%)

Friday, March 22 Mercury is fast approaching its greatest eastern elongation from the Sun, which it reaches in just two days.

Tonight, the tiny planet reaches 50 percent lit and spans 7 on the sky. You can catch it easily after sunset, glowing at magnitude 0.5 and still 6 high in the west an hour after sunset. Although it cant outshine Jupiter a little higher up in the sky, its still a bright, unmissable point of light slowly sinking toward the horizon in the evening sky.

If youd like to net a bonus planet in the west, Uranus lies in Aries not far from Jupiter, just 5 northeast of the gas giant. Youll need binoculars or a small scope to net the distant world, which glows at magnitude 5.8 and spans just over 3 in apparent diameter. Look for a gray-hued, flat star just 2.2 due south of magnitude 4.3 Botein (Delta [] Arietis) in your optics.

Sunrise: 6:59 A.M. Sunset: 7:15 P.M. Moonrise: 4:56 P.M. Moonset: 6:07 A.M. Moon Phase: Waxing gibbous (94%)

Sky This Week is brought to you in part by Celestron.

The Sky This Week from March 15 to 22: A conjunction of Venus and Saturn - Astronomy Magazine

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Pons-Brooks and M31 – Astronomy Magazine

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pons-brooks-and-m31 https://www.astronomy.com/picture-of-the-day/photo/pons-brooks-and-m31/ Pons-Brooks and M31 | Astronomy Magazine Osama Fathi, taken from the Black Desert, Egypt Comet 12P/Pons-Brooks appears beneath the imposing figure of the Andromeda Galaxy (M31) in this composite shot taken March 8. A meteor streak is visible at upper left. The photographer used an astromodified mirrorless camera and a 135mm lens at f/3.5 and ISO 600 to capture 20 minutesContinue reading "Pons-Brooks and M31" https://www.astronomy.com/wp-content/uploads/sites/2/2024/03/IMG_1197.jpg?fit=1568%2C1960 InStock USD 1.00 1.00 article ASY 2024-03-12 2024-03-12 142308

Osama Fathi, taken from the Black Desert, Egypt

Comet 12P/Pons-Brooks appears beneath the imposing figure of the Andromeda Galaxy (M31) in this composite shot taken March 8. A meteor streak is visible at upper left. The photographer used an astromodified mirrorless camera and a 135mm lens at f/3.5 and ISO 600 to capture 20 minutes of sky data in 30 and 60-second exposures. The foreground is a two-second exposure at ISO 400.

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Pons-Brooks and M31 - Astronomy Magazine

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The slightly weird mathematical coincidence behind an eclipse – Astronomy Magazine

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This spectacular photographic sequence around totality shows some of the features you'll see if your sky is clear and you're in the path of totality April 8, 2024. Credit: Ben Cooper.

On April 8, 2024, millions across the U.S. will have the once-in-a-lifetime chance to view a total solar eclipse.Cities includingAustin, Texas; Buffalo, New York; and Cleveland, Ohio, will have a direct view of this rare cosmic event that lasts for just a few hours.

Whileyou can see many astronomical events, such ascometsand meteor showers, from anywhere on Earth, eclipses are different. You need to travel to whats called thepath of totalityto experience the full eclipse. Only certain places get an eclipses full show, and thats because of scale.

The relatively smallsize of the Moonand its shadow make eclipses truly once-in-a-lifetime opportunities. On average, total solar eclipses are visible somewhere on Earth once every few years. But from any one location on Earth,it is roughly 375 yearsbetween solar eclipses.

Im an astronomer, but I have never seen a total solar eclipse, so I plan to drive to Erie, Pennsylvania, in the path of totality, for this one. This is one of thefew chances I haveto see a total eclipse without making a much more expensivetrip to someplace more remote. Many people have asked me why nearby eclipses are so rare, and the answer is related to the size of the Moon and its distance from the Sun.

You can observe a solar eclipse when the Moon passes in front of the Sun, blocking some or all of the Sun from view. For people on Earth to be able to see an eclipse, the Moon, while orbiting around the Earth, must lie exactly along the observers line of sight with the Sun. Only some observers will see an eclipse, though, because not everyones view of the Sun will be blocked by the Moon on the day of an eclipse.

The fact that solar eclipses happen at all is a bit of a numerical coincidence. It just so happensthat the Sunis approximately 400 timeslarger than the Moonand also 400 times more distant from the Earth.

So, even though the Moon is much smallerthan the Sun, it is just close enough to Earth to appear the same size as the Sun when seen from Earth.

For example, your pinky finger is much, much smaller than the Sun, but if you hold it up at arms length, it appears to your eye to be large enough to block out the Sun. The Moon can do the same thing it can block out the Sun if its lined up perfectly with the Sun from your point of view.

When the Earth, Moon and Sun line up perfectly, the Mooncasts a shadow onto the Earth. Since the Moon is round, its shadow is round as it lands on Earth. The only people who see the eclipse are those in the area on Earth where the shadow lands at a given moment.

The Moon is continuously orbiting around the Earth, so as time goes on during the eclipse, the Moons shadow moves over the face of the Earth. Its shadow ends up looking like a thick line that can cover hundreds of miles in length. Astronomers call that line thepath of totality.

From any given location along the path of totality, an observer can see the Sun completely eclipsed for a few minutes. Then, the shadow moves away from that location and the Sun slowly becomes more and more visible.

Solar eclipses dont happen every single time the Moon passes in between Earth and the Sun. If that were the case, there would be a solar eclipse every month.

If you could float above the Earths North Pole and see the Moons orbit from above, you would see the Moon line up with the Sun once every time it orbits around the Earth, which is approximately once per month. From this high point of view, it looks like the Moons shadow should land on Earth every orbit.

However, if you could shift your perspective to look at the Moons orbit from the orbital plane, you would see that the Moons orbit istilted by about 5 degreescompared with Earths orbit around the Sun. This tilt means that sometimes the Moon is too high and its shadow passes above the Earth, and sometimes the Moon is too low and its shadow passes below the Earth. An eclipse happens onlywhen the Moon is positioned just rightand its shadow lands on the Earth.

As time goes on, the Earth and the Moon continue spinning, andeventually the Moon aligns with Earths orbitaround the Sun at the same moment the Moon passes between the Sun and the Earth.

While only certain cities are in the path of totality for this Aprils eclipse, the entire U.S. is still close enough to this path that observers outside of the path of totality will see apartial eclipse. In those locations, the Moon will appear to pass in front of part of the Sun, leaving a crescent shape of the Sun still visible at the moment of maximum eclipse.

The author is an Associate Dean for Undergraduate Students and Teaching Professor of Astronomy & Astrophysics at Penn State

This article was originally published on The Conversation. It is republished under a Creative Commons license.

The slightly weird mathematical coincidence behind an eclipse - Astronomy Magazine

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APOD: 2024 March 17 NGC 7714: Starburst after Galaxy Collision – Astronomy Picture of the Day

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

2024 March 17

Explanation: Is this galaxy jumping through a giant ring of stars? Probably not. Although the precise dynamics behind the featured image is yet unclear, what is clear is that the pictured galaxy, NGC 7714, has been stretched and distorted by a recent collision with a neighboring galaxy. This smaller neighbor, NGC 7715, situated off to the left of the frame, is thought to have charged right through NGC 7714. Observations indicate that the golden ring pictured is composed of millions of older Sun-like stars that are likely co-moving with the interior bluer stars. In contrast, the bright center of NGC 7714 appears to be undergoing a burst of new star formation. The featured image was captured by the Hubble Space Telescope. NGC 7714 is located about 130 million light years away toward the constellation of the Two Fish (Pisces). The interactions between these galaxies likely started about 150 million years ago and should continue for several hundred million years more, after which a single central galaxy may result.

Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (UMCP) NASA Official: Amber Straughn Specific rights apply. NASA Web Privacy, Accessibility, Notices; A service of: ASD at NASA / GSFC, NASA Science Activation & Michigan Tech. U.

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APOD: 2024 March 17 NGC 7714: Starburst after Galaxy Collision - Astronomy Picture of the Day

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How to Safely View the Eclipse National Radio Astronomy Observatory – National Radio Astronomy Observatory

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Are you planning on viewing the solar eclipse on April 8, 2024? Please make sure you are doing so safely. Do not look directly at the sun unless you are using special-purpose solar filters. Below are a few ways you can safely observe the solar eclipse.

Visit our Eclipse Basics page to learn about the different types of Eclipses.

The safest way to view a solar eclipse is to use special-purpose solar filters, like eclipse glasses or handheld solar viewers.

Remember the only safe time to look at the sun without solar filters is during the 2-4 minutes of total eclipse if you are at 100% totality. It is never safe to look at the sun without solar filters during any other phases of the eclipse, or if you are viewing a partial or annular eclipse.

Solar filters should have:

Do not use solar filters that are:

Remember: Homemade filters or ordinary sunglasses, even very dark ones, are not safe for looking at the sun.

You can use a pinhole projector to safely view the eclipse without looking directly at the sun.

You can make your own or download and print ours.

If you have a Cricut Machine you can download several of our templates for free in the Cricut Design Space.

Light from the Sun travels through the small hole and reflects the image of the Sun on the screen, creating a safe way to look at the Sun, especially during a solar eclipse.

Are you in New Mexico and looking for eclipse glasses or pinhole projectors?

If you want to learn more about eclipses and the sun you can read several posts from our Ask an Astronomer page:

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