Astronaut Steve Bowen works outside the International Space Station's Quest airlock during Monday's spacewalk. Bowen's spacewalk was unexpectedly extended by a computer malfunction. NASA TV hide caption

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NASA Ceremony Marks 25th Challenger Anniversary

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The space shuttle Atlantis docked to the International Space Station in May 2010. NASA has announced that Atlantis will fly one last mission in June 2011 before retirement. NASA/Getty Images hide caption

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NASA/Getty Images