An aircraft servicer marshals a Shuttle Training Aircraft STA on the Shuttle Landing Facility runway.

An aircraft servicer marshals a Shuttle Training Aircraft (STA) on the Shuttle Landing Facility runway at NASA's Kennedy Space Center in Florida. STS-133 Commander Steve Lindsey and Pilot Eric Boe flew two Gulfstream II business jets that are modified to mimic the shuttle's handling during the final phase of landing. Practice landings are part of the Terminal Countdown Demonstration Test (TCDT), which provides each shuttle crew and launch team an opportunity to participate in various simulated activities, including equipment familiarization and emergency training at the launch pad.

Space shuttle Discovery and its STS-133 crew will deliver the Permanent Multipurpose Module, packed with supplies and critical spare parts, as well as Robonaut 2, the dexterous humanoid astronaut helper, to the International Space Station. Launch is targeted for Nov. 1 at 4:40 p.m. For more information on the STS-133 mission, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts133/. Photo credit: NASA/Amanda Diller