Astronauts to Address Leak During Short-Notice Spacewalk

The U.S. space agency, NASA, says astronauts aboard the International Space Station will perform a previously unscheduled spacewalk Saturday to deal with an ammonia coolant leak outside the station. The short-notice spacewalk came together after teams on Earth and in space quickly readied a plan of action.   

U.S. astronauts Chris Cassidy and Tom Marshburn will conduct the spacewalk, which is expected to last six hours and 15 minutes. They will inspect the cooling system, try …

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