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ISS039-E-014878 (22 April 2014) --- Part of the upper body of NASA astronaut Rick Mastracchio is pictured in a "selfie" or self-portrait during a spacewalk to replace a failed backup computer relay box in the S0 truss of the International Space Station on April 22, 2014. He was accompanied on the spacewalk by fellow Flight Engineer Steve Swanson of NASA.
