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Five Questions with Astronaut Rex Walheim

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Rex Walheim in space

Rex Walheim at work on a spacewalk during STS-122, February 2008.

Credit: NASA

Rex Walheim is an astronaut. He's gone to space three times, including on the last flight of the space shuttle. He has spent an accumulated 36 hours outside the ISS on spacewalks. He has tweeted from 240 miles above sea level.

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