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KENNEDY SPACE CENTER, Fla. -- After the rollback of the Rotating Service Structure on Launch Pad 39A, Space Shuttle Endeavour is marked with shadows from the lights on the Fixed Service Structure. Above the orange external tank is the Gaseous Oxygen Vent Hood, often called the "beanie cap," waiting to be lowered. The hood helps vent gaseous oxygen vapors away from the Space Shuttle until launch, when it is raised and retracted two and a half minutes before liftoff. Endeavour waits for mission STS-99, known as the Shuttle Radar Topography Mission (SRTM), which will chart a new course to produ…
