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In this image taken from video provided by NASA, astronauts Rick Mastracchio, top, and Michael Hopkins work to repair an external cooling line on the International Space Station on Tuesday, Dec. 24, 2013, 260 miles above Earth. The external cooling line — one of two — shut down Dec. 11. The six-man crew had to turn off all nonessential equipment, including experiments.

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Astronauts complete rare Christmas Eve spacewalk

Space station astronauts repaired a crippled cooling system during a rare Christmas Eve spacewalk Tuesday, braving a "mini blizzard" of noxious ammonia as they popped in a new pump.

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