Image: NASA Astronaut Tim Kopra on Dec. 21 spacewalk
Wednesday, December 23, 2015 - 11:26
in Astronomy & Space
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.