International Space Station commander live-tweets emergency spacewalk [photos]

Reports of an ammonia leak in the International Space Station’s cooling system sent two astronauts on an unscheduled spacewalk today, which was documented as it happened by Commander Chris Hadfield. Chris Cassidy and Tom Marshburn were charged with heading outside to investigate and replace a 260-pound pump controller box.

The repair mission was streamed live via the Internet as well via helmet-mounted cameras.

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