High Quality Content by WIKIPEDIA articles! STS-133 (ISS assembly flight ULF5) was the 133rd mission in NASA`s Space Shuttle program; during the mission, Space Shuttle Discovery docked with the International Space Station. It was Discovery`s 39th and final mission. The mission launched on 24 February 2011, and landed on 9 March 2011. The crew consisted of six American astronauts, all of whom had been on prior spaceflights, headed by Commander Steven Lindsey. The crew joined the long-duration six person crew of Expedition 26, who were already aboard the space station. About a month before lift-off, one of the original crew members, Tim Kopra, was injured in a bicycle accident. He was replaced by Stephen Bowen.