Photos: Shuttle Discovery's last flight
Space Shuttle
Credit: ASSOCIATED PRESS
NASA workers walk near the external tank, rear, of the space shuttle Discovery at the Kennedy Space Center in Cape Canaveral, Fla., Wednesday, Feb. 23, 2011. The space shuttle Discovery is scheduled to lift off Thursday afternoon on on its final voyage, an 11-day mission to the international space station. (AP Photo/Wilfredo Lee)
![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]")
