Cosmonauts Oleg Kotov, Expedition 38 commander, and flight engineer Sergey Ryazanskiy perform a spacewalk outside the International Space Station on Dec. 27, 2013. NASA astronaut Rick Mastracchio took... more 
Cosmonauts Oleg Kotov, Expedition 38 commander, and flight engineer Sergey Ryazanskiy perform a spacewalk outside the International Space Station on Dec. 27, 2013. NASA astronaut Rick Mastracchio took this photo from inside the station. less 
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SPACE.com | Photo By NASA/Rick Mastracchio, via @AstroRM
Fri, Dec 27, 2013 6:30 PM EST