NASA astronaut Scott Kelley answers a question about his scheduled mission aboard the International Space Station during a briefing Wednesday, Dec. 5, 2012, at Johnson Space Center in Houston. Kelly and Russian cosmonaut Mikhail Kornienko will spend an entire year aboard the International Space Station beginning in 2015. (AP Photo/David J. Phillip)

Associated Press
NASA astronaut Scott Kelley answers a question about his scheduled mission aboard the International Space Station during a briefing Wednesday, Dec. 5, 2012, at Johnson Space Center in Houston. Kelly and Russian cosmonaut Mikhail Kornienko will spend an entire year aboard the International Space Station beginning in 2015. (AP Photo/David J. Phillip)
NASA astronaut Scott Kelley answers a question about his scheduled mission aboard the International Space Station during a briefing Wednesday, Dec. 5, 2012, at Johnson Space Center in Houston. Kelly and Russian cosmonaut Mikhail Kornienko will spend an entire year aboard the International Space Station beginning in 2015. (AP Photo/David J. Phillip)
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