(12/16/1999) --- As dawn breaks at Launch Pad 39B on the east coast of Florida, the Space Shuttle Discovery is revealed poised for flight on mission STS-103. The rollback of the Rotating Service Structure (left) was complete at 4:46 a.m. EST. STS-103 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