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Poised for Liftoff Space Shuttle Discovery rests in full view on the launch pad. Image above: The rolling back of Launch Pad 39B's Rotating Service Structure reveals orbiter Discovery. + Click for larger image. Image credit: NASA/KSC Launch of Space Shuttle Discovery on mission STS-114, NASA's Return to Flight mission, is set for Tuesday at 10:39 a.m. EDT. The launch pad's Rotating Service Structure (RSS) was rolled away from Discovery at 3:38 p.m. on Monday. When in place, the giant enveloping appendage is used to install payloads into an orbiter's cargo bay and provide protection from inclement weather. With the...