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June 4, 2014
(16 Aug. 2010) --- NASA astronauts Tracy Caldwell Dyson (left) and Doug Wheelock, both Expedition 24 flight engineers, participate in a session of extravehicular activity (EVA) as construction and maintenance continue on the International Space Station. During the seven-hour, 20-minute spacewalk, Caldwell Dyson and Wheelock installed a spare pump module on the S1 truss, along with additional tasks.

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