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animals

Photo: NASA astronaut Scott Kelly on the International Space Station, conducting research on how micro gravity impacts aging and muscles of the C Elegan roundworm - @StationCDRKelly

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Mercury (planet)

NASA spacecraft orbiting Mercury is to crash into the planet around April 30, scientists say - @NBCNews

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International Space Station

Photo: Soyuz crew enters International Space Station; NASA astronaut Scott Kelly and cosmonaut Mikhail Kornienko will stay at the ISS for 342 days - @NASA

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space

Photo: NASA astronaut Scott Kelly seated right of Soyuz Commander Gennady Padalka; cosmonaut Mikhail Kornienko seated left on ride to ISS - @Space_Station

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space

Photo: NASA astronaut Scott Kelly and crew launch to ISS for nearly year-long trip - @NASA

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space

Editor's note: At 3:42 pm ET, NASA astronaut Scott Kelly and cosmonauts Mikhail Kornienko and Gennady Padalka will ride a Russian Soyuz rocket to the International Space Station. Kornienko and Kelly will stay at the ISS for 342 days, twice as long as any U.S. astronaut has ever stayed on the space station, CNN reports. NASA is studying the impact of long-duration spaceflights on the human body and retired astronaut Mark Kelly, Scott's twin brother, has volunteers to see how they change over the year in different environments. During this trip, Padalka will be setting a record for the most total time in space for a human. - Stephanie

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National Aeronautics and Space Administration

NASA asteroid mission now set for December 2020 launch; current top target is asteroid 2008 EV5. - @b0yle

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National Aeronautics and Space Administration

Scientists send letter to Sen. Ted Cruz, R-Texas, saying NASA must study earth - @mashable

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Cape Canaveral Air Force Station, FL, US

NASA successfully launches spacecraft to study magnetic fields surrounding the Earth and the sun - @AP

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Cape Canaveral Air Force Station, FL, US

Photo: Atlas V rocket sits on its Cape Canaveral, Fla., pad in preparation for 10:44pm ET launch - @NASA_MMS

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Jupiter

NASA confirms there's an ocean on Jupiter's moon Ganymede - @verge

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Butch Wilmore

Photo: Ground crews wrap Astronaut Barry Wilmore in blankets after he returns to Earth from International Space Station - @NASA

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International Space Station

Soyuz crew lands in Kazakhstan after 167 days on the International Space Station - @Space_Station

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International Space Station

International Space Station crew begins deorbit burn to return to Earth - @NASA

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Ceres

NASA scientists 'exhilarated' as Dawn spacecraft orbits mini-planet Ceres - @@usatoday

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National Aeronautics and Space Administration

Spacecraft "healthy" as it orbits #Ceres, @NASA_Dawn mission controllers say http://t.co/PDxLHm8AWj http://t.co/h2nbf6oRyB - @BBCBreaking

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National Aeronautics and Space Administration

#BREAKING NASA: Dawn spacecraft is in orbit around Ceres for the first visit to a dwarf planet http://t.co/Hjfzzytabz - @USATODAY

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National Aeronautics and Space Administration

NASA's Dawn spacecraft slips into orbit around dwarf planet Ceres 8 years after launch - @NBCNews

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space

NASA probe Dawn set to go into orbit around dwarf planet Ceres - @BBCNews

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National Aeronautics and Space Administration

Video: NASA's Barry Wilmore accepts Michelle Obama's 'Let's Move' challenge, showing how astronauts workout in space - @NASA

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