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. . > More Information on Planned Spacewalks