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Extra-vehicular activity (EVA). Rick Mastracchio and Steve Swanson April 23 (photo, video)

Outside the International Space Station, Expedition 39 Flight Engineers Rick Mastracchio and Steve Swanson of NASA conducted a spacewalk April 23 to replace a backup computer relay box on the station's S0 (s-zero) truss (photo)Outside the International Space Station, Expedition 39 Flight Engineers Rick Mastracchio and Steve Swanson of NASA conducted a spacewalk April 23 to replace a backup computer relay box on the station's S0 (s-zero) truss (photo)

Outside the International Space Station, Expedition 39 Flight Engineers Rick Mastracchio and Steve Swanson of NASA conducted a spacewalk April 23 to replace a backup computer relay box on the station's S0 (s-zero) truss (photo)Outside the International Space Station, Expedition 39 Flight Engineers Rick Mastracchio and Steve Swanson of NASA conducted a spacewalk April 23 to replace a backup computer relay box on the station's S0 (s-zero) truss (photo)

Outside the International Space Station, Expedition 39 Flight Engineers Rick Mastracchio and Steve Swanson of NASA conducted a spacewalk April 23 to replace a backup computer relay box on the station’s S0 (s-zero) truss.