Stock Photo - NASA astronaut Chris Cassidy, Expedition 36 flight engineer, participates in a session of extravehicular activity (EVA) as work continues on the International Space Station. During the six-hour, seven-minute spacewalk, Cassidy and European Space Agency astronaut Luca Parmitano (out of frame), flight engineer, prepared the space station for a new Russian module and performed additional installations on the station's backbone.
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