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KENNEDY SPACE CENTER, FLA. - At NASA’s Kennedy Space Center, Space Shuttle Discovery, resting on the Mobile Launcher Platform, returns to the Vehicle Assembly Building (VAB) along the crawlerway, which seems to stretch to the Atlantic Ocean on the horizon. Once inside the VAB, it will be demated from its External Tank and lifted into the transfer aisle. On or about June 7, Discovery will be attached to its new tank and Solid Rocket Boosters, which are already in the VAB. Only the 15th rollback in Space Shuttle Program history, the 4.2-mile journey allows additional modifications to be made to the External Tank prior to a safe Return to Flight. Discovery is expected to be rolled back to the launch pad in mid-June for Return to Flight mission STS-114. The launch window extends from July 13 to July 31. [Photo courtesy of Scott Andrews]