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Scott J. Kelly

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FILE - In this July 25, 2012 file photo, Mark Kelly, retired NASA astronaut and commander of mission STS-134, briefs the media at the European Organization for Nuclear Research in Meyrin near Geneva, Switzerland. Mark and his twin Scott Kelly are taking part in an unprecedented study of identical twins looking into the effects of prolonged weightlessness. Mark will undergo tests on Earth while his brother Scott will embark on a one-year space station stint. (AP Photo/Keystone/Martial Trezzini, File)

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FILE - In this Oct. 3, 2010 file photo, astronaut Scott Kelly crew member of the mission to the International Space Station, ISS, looks on in a museum at the Russian leased Baikonur cosmodrome, Kazakhstan. Scott and his twin Mark Kelly are taking part in an unprecedented study of identical twins looking into the effects of prolonged weightlessness. Mark will undergo tests on Earth while his brother Scott will embark on a one-year space station stint. (AP Photo/Dmitry Lovetsky, File)

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FILE - In this May 28, 2008 file photo, space shuttle Discovery commander Mark Kelly, right, gestures as he walks with his twin brother, astronaut Scott Kelly, left, and mission specialist Ron Garan, after arrival at Kennedy Space Center in Cape Canaveral, Fla. Scott and his twin Mark are taking part in an unprecedented study of identical twins looking into the effects of prolonged weightlessness. Mark will undergo tests on Earth while Scott will embark on a one-year space station stint. (AP Photo/Terry Renna, File)

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FILE - In this Oct. 8, 2010 file photo, U.S. astronaut Scott Kelly, a crew member of the mission to the International Space Station, accompanied by his brother Mark Kelly, right, walks before the launch of the Soyuz-FG rocket at the Russian-leased cosmodrome in Baikonur, Kazakhstan. Scott and his twin Mark are taking part in an unprecedented study of identical twins looking into the effects of prolonged weightlessness. Mark will undergo tests on Earth while Scott will embark on a one-year space station stint. (AP Photo/Dmitry Lovetsky, File)

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FILE - This undated file photo provided by NASA shows astronauts Mark Kelly, right, and Scott Kelly in the check-out facility at Ellington Field near NASA's Johnson Space Center in Houston. Scott and his twin Mark are taking part in an unprecedented study of identical twins looking into the effects of prolonged weightlessness. Mark will undergo tests on Earth while his brother Scott will embark on a one-year space station stint. (AP Photo/NASA, File)

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This undated photo provided by NASA, astronauts Mark Kelly, right, STS-124 commander, and Scott Kelly are pictured in the check-out facility at Ellington Field near NASA's Johnson Space Center in Houston. NASA announced Friday, March 7, 2014, that Mark Kelly and astronaut Scott Kelly will participate in 10 different investigations. Craig Kundrot, deputy chief scientist of NASA's Human Research Program, says in a news release that the brothers provide a unique opportunity to study two people with the same genetics who were in different environments. Officials say Scott Kelly spent a year in space while Mark Kelly was on Earth. NASA says it is hoping the studies can be the basis for future research initiatives. (AP Photo/NASA)

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U.S. astronaut Scott Kelly (left) and Russian cosmonaut Mikhail Kornienko will spend a year on the International Space Station beginning in 2015 to provide a medical foundation for future missions beyond low-Earth orbit. Mr. Kelly’s twin, Mark, is a retired astronaut married to former Rep. Gabrielle Giffords. (Gagarin Cosmonaut Training Center via NASA, Associated Press)

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U.S. astronaut Scott Kelly (left) and Russian cosmonaut Mikhail Kornienko will spend a year on the International Space Station beginning in 2015 to provide a medical foundation for future missions beyond low-Earth orbit. Mr. Kelly’s twin, Mark, is a retired astronaut married to former Rep. Gabrielle Giffords. (Gagarin Cosmonaut Training Center via NASA, Associated Press)

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In this Thursday, March 17, 2010 picture, Expedition 26 Commander Scott Kelly, left, is reunited with his twin brother, Mark Kelly following a flight back to Ellington Field in Houston from Kustanai, Kazakhstan. Scott Kelly landed in Kazakhstan on March 16 with his Russian crewmates in the Soyuz TMA-01M spacecraft after 159 days in space, 157 days on the International Space Station. Mark Kelly is in the final weeks of training as Commander of the final flight of Endeavour, STS-134, that will spend more than a week docked to the ISS. Endeavour is targeted for launch on April 19, 2011. (AP Photo/NASA, Rob Navias)

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In this March 15, 2011 photo provided by NASA, astronaut Scott Kelly, Expedition 26 commander, right, poses with Robonaut 2, the dexterous humanoid astronaut helper, in the Destiny laboratory of the International Space Station. (AP Photo/NASA)

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In a photo provided by NASA, Expedition 26 Commander Scott Kelly wears a blue wrist band that has a peace symbol, a heart and the word "Gabby" to show his love of his sister-in-law, U.S. Rep. Gabrielle Giffords, as he rest onboard a Russian Search and Rescue helicopter shortly after he and fellow crew members Oleg Skripochka and Alexander Kaleri landed in their Soyuz TMA-01M capsule near the town of Arkalyk, Kazakhstan on Wednesday, March 16, 2011. NASA astronaut Kelly, and Russian cosmonauts Skripochka and Kaleri are returning from almost six months onboard the International Space Station where they served as members of the Expedition 25 and 26 crews. (AP Photo/NASA, Bill Ingalls)

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In this photo provided by NASA, Expedition 26 Commander Scott Kelly wears a blue wristband that has a peace symbol, a heart and the name "Gabby" to show his support for his sister-in-law, U.S. Rep. Gabrielle Giffords, as he rested onboard a Russian Search and Rescue helicopter shortly after he and fellow crew members Oleg Skripochka and Alexander Kaleri landed in their Soyuz TMA-01M capsule near the town of Arkalyk, Kazakhstan, on Wednesday, March 16, 2011. NASA Astronaut Kelly, Russian Cosmonauts Skripochka and Kaleri are returning from almost six months onboard the International Space Station where they served as members of the Expedition 25 and 26 crews. (AP Photo/NASA, Bill Ingalls) MANDATORY CREDIT

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US astronaut Scott Kelly is seen inside of Russian Soyuz TMA-01M spacecraft shortly after their landing near the town of Arkalyk in northern Kazakhstan, Wednesday, March 16, 2011. NASA astronaut Scott Kelly and two Russian cosmonauts landed safely Wednesday in the snowy expanses of central Kazakhstan after spending a five-month stint on the International Space Station.(AP Photo/Sergei Remezov, Pool)