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KENNEDY SPACE CENTER, FLA. -- Inside NASA's Vehicle Assembly Building, the crawler transporter supporting Space Shuttle Discovery on its mobile launcher platform is ready to roll out to Launch Pad 39B with its cargo. The open area above the crawler is the opening for the exhaust of one of the solid rocket boosters (two other openings are provided for main engines and second booster). The rollout is an important step before launch of Discovery on mission STS-121 to the International Space Station. Discovery's launch is targeted for July 1 in a launch window that extends to July 19. During the 12-day mission, Discovery's crew will test new hardware and techniques to improve shuttle safety, as well as deliver supplies and make repairs to the station. Photo credit: NASA/Jack Pfaller