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NASA Astronauts Preparing for Potential Spacewalk

Stocktrek Images/Thinkstock(HOUSTON) -- NASA is planning for at least two, if not three spacewalks to fix a broken cooling unit on the International Space Station. A decision from the space agency is expected this week.

Engineers are working around the clock to try to regulate temperatures in one of two cooling loops on the International Space Station affected by the malfunction last week of a flow control valve in a cooling pump on the station's starboard truss.

Engineers are still trying to fix the problem remotely from Mission Control.

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