Astronauts Chris Cassidy and Tom Marshburn completed the most impromptu spacewalk in NASA history ahead of schedule. The two men spent roughly five hours outside of the International Space Station repairing an ammonia pump used to cool the laboratory's engine system.
Reddit's Ask Me Anything feature is often fun because it enables regular old Redditors to talk to really cool famous people like the president or, as was the on Sunday, an astronaut orbiting the Earth.
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