NASA has ordered up a series of urgent spacewalks to fix a broken cooling line at the International Space Station. Station managers decided today to send two American astronauts out as soon as possible to replace a pump that contains a bad valve. It's a big job that will require at least two or three spacewalks. The first is scheduled for Saturday. The spacewalks are taking priority over the launch of a supply ship from Wallops Island on Thursday, but is now delayed until January.
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