The astronauts ran about an hour and a half ahead of what NASA expected to be their timeline.
Rich Mastracchio and Mike Hopkins, Expedition 38 Flight Engineers, began at 7:01 am EST Saturday morning to replace a degraded ammonia pump module associated with one of the station’s two cooling loops that keeps internal and external equipment cool, NASA said.
Mastracchio, the lead spacewalker, conducted six previous spacewalks, and holds the record for the 14th longest number of hours of spacewalking. Hopkins made his first spacewalk.
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