As dawn breaks at Launch Pad 39B on the east coast of Florida, the Space Shuttle Discovery is revealed after rollback of the Rotating Service Structure. The rollback of the structure was complete at 4:46 a.m. EST. Poised for flight on mission STS-103, Discovery is scheduled for launch Dec. 16 at 9:18 p.m. EST. The mission is expected to last about 9 days and 21 hours with a landing at KSC Sunday, Dec. 26, at 6:56 p.m. EST