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