CAPE CANAVERAL, Fla. - Discovery is ready to leave the International Space Station for the last time.
In this March 4, 2011 photo provided by NASA, inside the newly installed Permanent Multipurpose Module (PMM) on the International Space Station are the six crew members of the STS-133 crew who've been spending busy days with the six astronauts and cosmonauts of Expedition 26, not shown. At bottom, from the left, are astronauts Eric Boe, Steve Lindsay and Michael Barratt. On top are astronauts Alvin Drew, Nicole Stott and Steve Bowen (AP Photo/NASA)The space shuttle is due to undock Monday morning. It won't land until Wednesday.
This is the final voyage for Discovery, the most traveled spaceship ever. It will be retired after this mission and sent to a museum.
Discovery and its crew of six spent more than a week at the space station, installing a new storage unit and an equipment platform.
Mission Control, meanwhile, is monitoring a piece of space junk that's threatening to come too close to the station. Experts will decide following Monday's undocking whether the station will need to move out of harm's way. The debris is an old rocket piece.