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NASA Administrator Charles Bolden signs the official transfer document transferring possession of Space Shuttle Discovery to the Smithsonian during the Welcome Discovery Ceremony at the Smithsonian's Udvar-Hazy National Air and Space Museum's annex on April 19, 2012. © Mike Lynaugh

NASA Administrator Charles Bolden signs the official transfer document transferring possession of Space Shuttle Discovery to the Smithsonian during the Welcome Discovery Ceremony at the Smithsonian's Udvar-Hazy National Air and Space Museum's annex on April 19, 2012.

© Mike Lynaugh