Communications of the ACM
ACM Careers
Five Questions with Astronaut Rex Walheim
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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