International Space Station Expedition 46 Commander Scott Kelly during a spacewalk, in which Kelly and Flight Engineer Tim Kopra successfully moved the International Space Station's mobile transporter rail car ahead of a docking of a Russian cargo supply spacecraft, December 21, 2015. After quickly completing their primary objective for the spacewalk, Kelly and Kopra tackled several additional tasks. Kelly routed a second pair of cables in preparation for International Docking Adapter installment work to support U.S. commercial crew vehicles. Kopra routed an Ethernet cable that ultimately will connect to a Russian laboratory module. They also retrieved tools that had been in a toolbox on the outside of the station, so they can be used for future work.
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