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KENNEDY SPACE CENTER, FLA. -- Space Shuttle Discovery, seen behind the orange external tank and white solid rocket boosters, moves into place on the hardstand of Launch Pad 39B. The shuttle rests on a mobile launcher platform and made the 4.2-mile journey from the Vehicle Assembly Building via the crawler-transporter beneath the platform. 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/Dimitri Gerondidakis