Stock Photo - Expedition 35 Flight Engineers Chris Cassidy takes a self portrait, as he and Tom Marshburn (seen partially in Cassidy's helmet visor) accomplished a space walk on May 11 to inspect and replace a pump controller box on the International Space Station's far port truss (P6) leaking ammonia coolant. The two NASA astronauts began the 5-hour, 30-minute space walk at 8:44 a.m. and completed it at 2:14 p.m. EDT.

Stock Photo: Expedition 35 Flight Engineers Chris Cassidy takes a self portrait, as he and Tom Marshburn (seen partially in Cassidy's helmet visor) accomplished a space walk.

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