NASA: 4 Spacewalks Needed to Complete Space Station Repairs

Space Station Astronauts Remove Faulty Pump in Urgent Repairs
NASA astronaut Douglas Wheelock (bottom, on robotic arm) removes a faulty ammonia pump on the International Space Station during a Wednesday, Aug. 11, 2010 spacewalk with crewmate Tracy Caldwell Dyson.
(Image: © NASA TV.)

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