Daily Archives: December 9, 2014

StarTalk Spotlight: Astronaut Ricky Arnold and Elmo
While covering the Orion launch for StarTalk Radio, our Social Media Coordinator Stacey Severn was able to grab this interview with NASA astronaut Ricky Arnold and Sesame Street #39;s Elmo. They...

By: StarTalk Radio

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StarTalk Spotlight: Astronaut Ricky Arnold and Elmo - Video

NASA TV Presents: Inside the ISS - December 2014
A look inside the life, science and adventure of being an astronaut aboard the International Space Station. http://www.nasa.gov/mission_pages/station.

By: NASA

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NASA TV Presents: Inside the ISS - December 2014 - Video

A European Space Agency (ESA) experiment aboard the International Space Station (ISS) suggests that space travelers may have less to worry about when it comes to radiation ... thanks to a phantom. Called the Matroshka, the "phantom" is a plastic mannequin that is the key component of the first comprehensive study of the effects of radiation on astronauts on long-term space missions that indicates that the hazard may not be as severe as previously thought.

Of all the perils of space travel, the most pervasive as it is intangible is radiation. Each day that an astronaut spends outside the protective confines of the Earth's atmosphere brings an increased chance of cancer and other conditions. According to ESA, a person on the ground soaks up about 2.5 mSv/year, while an astronaut on the space station can receive up to 1 mSv/day. This is the reason the European Astronaut Corps limits its members to 500 mSv/year and 1Sv for an entire career. (Sv or sievert is a unit used to measure of the health effect of small amounts of radiation on the body).

Surprisingly, despite this awareness, very little is actually known about how exactly how much and what kind of radiation an astronaut is actually exposed to. It's to fill this gap that the Matroshka was sent to the ISS. Named after the famous Russian nesting dolls, it was built and operated by ESA in cooperation with Roscosmos and various European institutions, and was flown to the station in 2004. Its purpose was to measure the type and amount of radiation astronauts are exposed to both inside and outside the space station over a period of several years.

Matroshka covered by a container simulating a spacesuit (Photo: DLR)

The Matroshka is technically a phantom. That is, a radiological doll designed as a stand-in for a human being while testing radiation equipment or, in this case, space radiation. It consists of a head and torso made of 33 horizontal cross sections of plastic, each measuring 2.5 cm (1 in) thick. Layers are used, so the mannequin can be assembled around a central dowel, which makes it easy to install and remove sensors. Each layer is made of a special plastic that simulates the soft tissues of the body with different densities standing in for the muscles, liver, spleen, lungs, and so forth. In addition, there are pieces of real human bone inserted into the cross sections to provide the proper radiological properties and a battery of sensors.

Space radiation is composed mainly of cosmic rays made up of protons and other heavy ions instead of the more common gamma rays found in terrestrial radiation sources. Since there are many different kinds of different radiation, so a number of different active and passive sensors are needed to detect them. The Matroshka includes about a dozen different sensors, including detectors for recording pressure and temperature.

Among the sensors are six thousand passive thermoluminescent detectors many of which were made by the Institute of Nuclear Physics of the Polish Academy of Sciences (IFJ PAN) in Krakw, Poland. They are constructed of doped lithium fluoride placed in plastic tubes set in a 3D lattice. The dopants upset the detector's crystalline structure, which sets up "forbidden" energy levels that capture electrons generated by cosmic rays. When the tubes are returned to Earth and heated in a laboratory, they release light in proportion to the amount of radiation they've absorbed.

The Matroshka phantom with astronauts S. Krikaliew and J. Philips on board of the International Space Station (Photo: NASA)

Over the Matroshka is a not very fashionable jacket, which isn't just there for looks. It also acts as a mounting for cables and additional detectors. The latter need to be placed on the outside of the mannequin in order to measure incoming radiation and skin exposure, and to simulate the dosimeters carried by all space station personnel.

From 2004 to 2009, the Matroshka sat inside one of the Russian modules on the ISS, but radiation hazards outside the station are many times greater than inside, so the phantom made a spacewalk for the first such exposure measurements ever made. Like a human astronaut, the Matroshka was clad in a spacesuit or, at least, a simulated one made of layers of carbon fiber and plastic and filled with dry oxygen gas.

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Plastic phantom shows space travel may be safer than thought

Portugal's Minister of Education and Science Nuno Crato said Wednesday that Portugal will integrate two scientific space exploration programs including the International Space Station, according to Portuguese Lusa News Agency.

"There is a lot of good news or Portugal, which will continue collaborating with the European Space Agency (ESA) ... and will now incorporate the program for International Space Station and the program for Lunar Exploration," Nuno Crato told Lusa, after participating at a meeting at the ESA in Luxembourg.

Ministers of the ESA met Tuesday in Luxembourg, and agreed to develop new launchers, as well as approving investment in the international space station and space exploration programs.

Crato said that Portugal benefited through its participation with ESA "on various levels," like Portuguese scientists getting involved with the space agency's work and enabling the country to use more sophisticated technology.

"Being part of the International Space Station is very important for us ... The program for lunar exploration is a new program and we will join it from the start. So our software development companies will participate in this effort and will be able to make orders from these programs," Crato added.

The next ESA meeting will take place in Switzerland in 2016.

Source: Xinhua News Agency

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Portugal to integrate two scientific space exploration programs: media

China hopes to put a rover on Mars around 2020, complete a manned space station around 2022 and test a heavy carrier rocket around 2030, a top space scientist revealed Sunday.

Lei Fanpei, chairman of the China Aerospace Science and Technology Corporation (CASC), the main contractor for the space program, revealed the details in an interview with Xinhua after the launch of CBERS-4, a satellite jointly developed with Brazil, from the Taiyuan base, by a Long March-4B rocket.

It was the 200th flight of the Long March variants since April 1970 when a Long March-1 carried China's first satellite, Dongfanghong-1, into space.

MARS PROBE 2020 A feasibility study on the country's first Mars mission is completed and the goal is now to send an orbiter and rover to Mars.

There has been no official announcement about a Mars probe yet, but Lei expects a Long March-5 carrier, still at the development stage, to take the orbiter into a Martian orbit around 2020 from a new launch site on south China's island province of Hainan.

China's space scientists have had their eyes on the Red Planet as their next destination since the successful soft landing on the moon late last year.

Last month, an actual-size model of a possible Mars rover was on display at Airshow China 2014, the first glimpse of how the vehicle might turn out.

China made an unsuccessful attempt to reach Mars in 2011 aboard a Russian rocket, but failed to complete the mission because of an accident during orbital transfer.

SPACE STATION 2022 China's manned space station program is progressing steadily. Various modules, vehicles and ground facilities are nearing readiness.

Development and manufacture of major space products are at key stages, including the second space lab Tiangong-2, the Tianzhou-1 cargo ship, Long March-7 rockets and Shenzhou-11 spacecraft. The core module and two space labs will be tested soon, Lei said.

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Countdown to China's new space programs begins