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NASA: Spacewalk planned to fix space station leak

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WASHINGTON (AP) — Two astronauts will make a hastily planned spacewalk Saturday to try to fix an ammonia leak in the power system of the International Space Station. The leak in a cooling system was discovered Thursday when "snowflakes" of ammonia were seen flying away from the station. Engineers on Earth were up overnight plotting an impromptu spacewalk. Spacewalks are rarely done on such...

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