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Spacewalker Ron Garan rides on the International Space Station's robotic arm as he transfers a failed pump module to the cargo bay of space shuttle Atlantis. Garan and fellow Expedition 28 astronaut Mike Fossum wrapped up a six-hour, 31-minute spacewalk Tuesday afternoon, performing upgrades and maintenance on the orbiting outpost. It's the final scheduled spacewalk during a shuttle mission. Image Credit: NASA
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