Astronaut Mike Hopkins on Dec. 24 Spacewalk
On Dec. 24, 2013, NASA astronaut Mike Hopkins, Expedition 38 Flight Engineer,
participates in the second of two spacewalks, spread over a four-day period,
which were designed to allow the crew to change out a degraded pump module on
the exterior of the Earth-orbiting International Space Station. He was joined on
both spacewalks by NASA astronaut Rick Mastracchio, whose image shows up in
Hopkins' helmet visor.
The pump module controls the flow of ammonia through cooling loops and
radiators outside the space station, and, combined with water-based cooling
loops inside the station, removes excess heat into the vacuum of space.
Image Credit: NASA
Guillermo Gonzalo Sánchez Achutegui
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