Space shuttle Discovery is attached to Launch Pad 39A as the sun rises over NASA's Kennedy Space Center in Florida. It took the spacecraft about six hours to make the journey, known as ''rollout,'' from the Vehicle Assembly Building to the pad. On its final mission, Discovery will take the Permanent Multipurpose Module (PMM) packed with supplies and critical spare parts, as well as Robonaut 2 (R2) to the International Space Station. Image credit: NASA/Jack Pfaller Sept. 21, 2010
