A spur-of-the-moment spacewalk conducted last weekend appears to have fixed a big ammonia leak at the International Space Station, NASA reported Thursday. The leak sprang a week ago, necessitating the hastiest repair job ever attempted by space station residents. Spacewalking astronauts replaced a suspect ammonia pump on Saturday, just two days after the trouble was discovered. Engineers don't know whether the pump replacement also took care of a smaller leak in the system that has been an issue for years. It will take at least a couple months of monitoring to know the full status. Ammonia is used as a coolant in the space station's radiator system. (Image Credit: NASA)
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