One last lap for Discovery

The Discovery and its six-member crew lift off from NASA's Kennedy Space Center in Florida on Feb. 24.

Just prior to its rendezvous, Discovery is photographed by an Expedition 26 crew member as the shuttle approaches the International Space Station.

A view of the nose, the forward underside and crew cabin.As part of every mission's activities, Discovery performed a back-flip for the rendezvous pitch maneuver. Its final flip.

The STS-133 crew took this photo of a docked Russian Soyuz spacecraft (right).Nice picture with a backdrop made up of the thin line of Earth's atmosphere and the emptiness of space.

Astronaut Steve Bowe on a spacewalk to vent some remaining ammonia from a failed pump module into space .

A busy Monday for Steve Bowen and Alvin Drew (partially obscured at center). The two spent about six and a half hours outside the space station doing myriad maintenance chores.

A good look at the aft portion of Discovery's main engines, part of the cargo bay, vertical stabilizer and orbital maneuvering system pods photographed by the crew during a survey of the vehicle's approach prior to its docking with the International Space Station.

Another look at Bowen and Drew going about their duties during their first spacewalk.

Discovery docks with the Canadian-built "Dextre," also known as the Special Purpose Dextrous Manipulator.

Alvin Drew emerging from the Quest airlock on the International Space Station.

President Obama speaks with the crew of the Space Shuttle Discovery and the International Space Station from the Oval Office, March 3, 2011.