Photos: Space shuttle Discovery
APTOPIX Space Shuttle
Credit: AP
Space shuttle Discovery lifts off from the Kennedy Space Center in Cape Canaveral, Fla., Thursday, Feb. 24, 2011. Discovery, the world's most traveled spaceship, thundered into orbit for the final time Thursday, heading toward the International Space Station on a journey that marks the beginning of the end of the shuttle era. (AP Photo/Chris O'Meara)
