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KENNEDY SPACE CENTER, FLA. - Orbital Sciences' L-1011 aircraft carries the Pegasus XL rocket/Galaxy Evolution Explorer (GALEX) under its belly. The aircraft is scheduled for takeoff in a window beginning at 7:50 a.m. and release of the Pegasus about 8 a.m. The GALEX will carry into space an orbiting telescope that will observe a million galaxies across 10 billion years of cosmic history to help astronomers determine when the stars and elements we see today had their origins. The spacecraft will sweep the skies for 28 months using state-of-the-art ultraviolet detectors to single out galaxies…