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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