Astronauts make rare Christmas Eve spacewalk

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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 Monday, 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. (AP Photo/NASA)