NASA: Third Spacewalk Required to Fix Space Station Cooling System

Record-Setting Spacewalk at Space Station Falls Short on Repairs
NASA astronauts Doug Wheelock and Tracy Caldwell Dyson, both Expedition 24 Flight Engineers, work to remove a failed ammonia pump module on the International Space Station's S1 Truss during a spacewalk on Aug. 7, 20102010.
(Image: © NASA TV 2010)

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