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 brought into the James S. McDonnell Space Hangar at the National Air and Space Museum's Steven F. Udvar-Hazy Center in Chantilly, Va., during its ceremonial arrival on Thursday, April 19, 2012. (Rod Lamkey Jr./The Washington Times)

The NASA space shuttle Discovery is brought into the James S. McDonnell Space Hangar at the National Air and Space Museum's Steven F. Udvar-Hazy Center in Chantilly, Va., during its ceremonial arrival on Thursday, April 19, 2012. (Rod Lamkey Jr./The Washington Times)

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