NASA is planning an emergency spacewalk-- more likely two-- to repair the ISS cooling system that collapsed Saturday. Two astronauts will replace a pump module that is supposed to the send supercold ammonia throughout the station, keeping its electrical systems from overheating.
"Emergency" may be a bit misleading. The first of the two spacewalks is scheduled for Thursday, after all-- which jibes with NASA's statement that the crew is in no danger-- so we don't have a desperate space drama unfolding unless something else goes wrong. Still, this is a major malfunction which is forcing an unscheduled repair-- never a good thing in the spaceflight business.
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