In this Dec. 21, 2015 photo, Expedition 46 Commander Scott Kelly participates in a spacewalk outside the International Space Station in which he and Flight Engineer Tim Kopra, not pictured, moved the station’s mobile transporter rail car ahead of the docking of a Russian cargo supply spacecraft. (NASA via AP)
Space superman Scott Kelly’s yearlong mission is one for the NASA history books.
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Astronaut Scott Kelly"s yearlong mission almost over
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