Photos: Shuttle Discovery's last flight
Space Shuttle
Credit: AP
STS-133 mission specialist Steve Bowen smiles at friends after leaving the Operations and Checkout Building for a trip to the launch pad at Kennedy Space Center in Cape Canaveral, Fla., Thursday, Feb. 24, 2011. The space shuttle Discovery is scheduled to lift off this afternoon on an 11-day mission to the international space station. Bowen replaced Tim Kopra on the crew after he was injured in a bicycle mishap. (AP Photo/Tery Renna)
![Space shuttle Discovery ready for voyage to museum [PHOTOS]](http://media.azfamily.com/images/96*53/SHUTTLE-BKGD.jpg "Space shuttle Discovery ready for voyage to museum [PHOTOS]")
