Space shuttle Discovery's external fuel tank is visible on Launch Pad 39A at NASA's Kennedy Space Center.

Space shuttle Discovery's external fuel tank is visible on Launch Pad 39A at NASA's Kennedy Space Center in Florida. Discovery's next mission is STS-133, which will deliver the Permanent Multipurpose Module (PMM), packed with supplies and critical spare parts, as well as Robonaut 2 (R2), to the International Space Station.

For more information on STS-133, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts133/. Photo credit: NASA/Frank Michaux