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Spacewalking Astronauts Tackle Pump Work at Space Station

NASA astronauts took a spacewalk Wednesday to shuffle around a couple of space station pumps. Popping out early, Drew Feustel and Ricky Arnold quickly began rearranging the International Space Station's external cooling system by swapping the positions of two spare ammonia pumps. NASA wants the best spare in the best spot to call into action if needed down the road. One pump got too cold because of a power shutdown 17 years ago and is called Frosty. The other spewed out ammonia...

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