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The space shuttle Discovery, sitting atop a 747 carrier aircraft lands, at Dulles International Airport in Chantilly, Va., Tuesday, April 17, 2012. Discovery, the longest-serving orbiter will be placed to its new home, the Smithsonian's National Air and Space Museum's Steven F. Udvar-Hazy Center in Chantilly, Va. (AP Photo/Manuel Balce Ceneta)

The space shuttle Discovery, sitting atop a 747 carrier aircraft lands, at Dulles International Airport in Chantilly, Va., Tuesday, April 17, 2012. Discovery, the longest-serving orbiter will be placed to its new home, the Smithsonian's National Air and Space Museum's Steven F. Udvar-Hazy Center in Chantilly, Va. (AP Photo/Manuel Balce Ceneta)

Discovery shuttle arrives at Smithsonian

NASA officially delivered the space shuttle Discovery, its longest serving crewed spacecraft, to the Smithsonian's National Air and Space Museum on Apr. 19 during a public ceremony to hand over the iconic winged spacecraft.