NASA Astronaut Tim Kopra on Dec. 21 Spacewalk

Expedition 46 Flight Engineer Tim Kopra on a Dec. 21, 2015 spacewalk, in which Kopra and Expedition 46 Commander Scott Kelly successfully moved the International Space Station's mobile transporter rail car ahead of Wednesday's docking of a Russian cargo supply spacecraft. via NASA http://ift.tt/1S8leHF

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