space shuttle Discovery space shuttle Discovery

Discovery is sitting atop NASA's 747 Shuttle Carrier Aircraft, which will fly the shuttle from Florida to Virginia. Roberto Gonzalez/Getty Images hide caption

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Roberto Gonzalez/Getty Images

Astronauts aboard the space shuttle Discovery, seen here lifting off from Kennedy Space Center in Florida, are preparing to dock with the International Space Station Saturday. Stan Honda/AFP/Getty Images hide caption

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Stan Honda/AFP/Getty Images