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The space shuttle Discovery flies piggyback atop a modified Boeing 747 in an undated photo. It will take a similar ride, its last, along the Potomac on Tuesday morning on its way to the Smithsonian's Steven F. Udvar-Hazy Center near Washington Dulles International Airport. (Photograph provided by NASA)

The space shuttle Discovery flies piggyback atop a modified Boeing 747 in an undated photo. It will take a similar ride, its last, along the Potomac on Tuesday morning on its way to the Smithsonian's Steven F. Udvar-Hazy Center near Washington Dulles International Airport. (Photograph provided by NASA)

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