Expedition 38 Astronauts Prepare for Spacewalks

©NASA

Astronauts Prepare for Spacewalks

Expedition 38 crew member Mike Hopkins checks out the spacesuit he will wear outside the International Space Station on Saturday, Dec. 21, 2013.

He and fellow astronaut Rick Mastracchio will conduct a series of spacewalks to replace an ammonia pump that is part of the station's coolant system. This will be Hopkins' first spacewalk, while Mastracchio has had six previous ones on STS-118 and STS-131.

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