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.
Photo by Associated Press /Chattanooga Times Free Press .
published Wednesday, December 25th, 2013
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CAPE CANAVERAL, Fla. — 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.