By MARCIA DUNN
12/17/13 06:32 PM ET EST
Station managers decided Tuesday to send two American astronauts out as soon as possible to replace a pump with a bad valve. The task will require two and possibly three spacewalks on Saturday, Monday and next Wednesday — Christmas Day.
"The next week will be busy with space walks so not much tweeting from here," NASA astronaut Rick Mastracchio said from space via Twitter soon after the decision was announced.
The spacewalks are taking priority over the launch of a supply ship from Virginia. The commercial delivery had been scheduled for this week, but is now delayed until at least mid-January.
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