Two NASA astronauts aboard the International Space Station began a spacewalk on Saturday to try to repair an ammonia leak in the cooling system for one of the International Space Station's massive solar arrays, just two days after the problem was detected, NBC News reported.
Saturday's operation ranks as one of the fastest turnarounds ever for a space station repair. The spacewalk began at 8:44 a.m. ET, about a half-hour later than originally planned, but the two veteran spacewalkers Tom Marshburn and Chris Cassidy made quick progress.
They went out to inspect a 260-pound pump box that's thought to be the source of the leak, and possibly replace it with a spare, according to NBC News.
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