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The space shuttle Discovery flies by the Smithsonian Castle on the back of a 747 plane on the way to Dulles Airport on April 17, 2012. Discovery will become part of the collection at the National AirThe space shuttle Discovery flies over Washington, DC on its final flight on April 17, 2012.A young boy holds his drawing of the space shuttle Discovery at the Steven F. Udvar-Hazy Center on April 19, 2012.Space shuttles Enterprise (left) and Discovery on display during a ceremony to transfer ownership of Discovery to the Smithsonian's Steven F. Udvar-Hazy Center on April 19, 2012. The Discovery takes tVisitors to the Steven F. Udvar-Hazy Center were encouraged to sign a banner for the space shuttle Discovery's induction on April 19, 2012.Instructors used a cooperative exercise to teach children about teamwork during "Welcome Discovery" celebrations at the Steven F. Udvar-Hazy Center on April 19, 2012. The goal was to move the plush piSpace shuttle Discovery is moved into its new home at the Steven F. Udvar-Hazy Center on April 19, 2012. Discovery takes the place of the museum's previous shuttle, Enterprise.