In this photo provided byNASA, space shuttles Enterprise, left, and Discovery meet nose-to-nose at the beginning of a transfer ceremony at the Smithsonian's Steven F. Udvar-Hazy Center, Thursday, April 19, 2012, in Chantilly, Va. Space shuttle Discovery will take the place of Enterprise at the center to commemorate past achievements in space and retire as an artifact representing the 30-year shuttle program. (AP Photo/NASA, Bill Ingalls) MANDATORY CREDIT

Associated Press
In this photo provided byNASA, space shuttles Enterprise, left, and Discovery meet nose-to-nose at the beginning of a transfer ceremony at the Smithsonian's Steven F. Udvar-Hazy Center, Thursday, April 19, 2012, in Chantilly, Va. Space shuttle Discovery will take the place of Enterprise at the center to commemorate past achievements in space and retire as an artifact representing the 30-year shuttle program. (AP Photo/NASA, Bill Ingalls) MANDATORY CREDIT
In this photo provided byNASA, space shuttles Enterprise, left, and Discovery meet nose-to-nose at the beginning of a transfer ceremony at the Smithsonian's Steven F. Udvar-Hazy Center, Thursday, April 19, 2012, in Chantilly, Va. Space shuttle Discovery will take the place of Enterprise at the center to commemorate past achievements in space and retire as an artifact representing the 30-year shuttle program. (AP Photo/NASA, Bill Ingalls) MANDATORY CREDIT
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