ISS Ammonia Leak Prompts Emergency Spacewalk

The International Space Station crew is preparing for an emergency spacewalk Saturday to fix an ammonia coolant leak from the orbiting laboratory.
The space station’s commander, Canadian Chris Hadfield, described the leak Friday as a “serious situation,” but one that has been stabilized by the six-member crew. He said on his Twitter account that two American astronauts, Chris Cassidy and Tom Marshburn, are getting their space suits ready to go outside the spacecraft to …

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