Shuttle Discovery's official welcome

Crowds cheer as the space shuttle Discovery trades places with Enterprise at the National Air and Space Museum's Udvar-Hazy Center.

The NASA space shuttle Discovery is prepared to be moved to a location in front of the riser for the ceremony after its arrival at the National Air and Space Museum's Steven F. Udvar-Hazy Center in Chantilly, Va., on Thursday, April 19, 2012. (Rod Lamkey Jr./The Washington Times)

The NASA space shuttle Discovery is prepared to be moved to a location in front of the riser for the ceremony after its arrival at the National Air and Space Museum's Steven F. Udvar-Hazy Center in Chantilly, Va., on Thursday, April 19, 2012. (Rod Lamkey Jr./The Washington Times)

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