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Two solid rocket boosters, in the background, are lifted up the gantry on Launch Pad 17-A, Cape Canaveral Air Force Station, for stacking with a Delta 7925 rocket. The rocket, scheduled to launch April 7, 2001, will carry the 2001 Mars Odyssey Orbiter, containing three science instruments: THEMIS, the Gamma Ray Spectrometer (GRS), and the Mars Radiation Environment Experiment (MARIE). THEMIS will map the mineralogy and morphology of the Martian surface using a high-resolution camera and a thermal infrared imaging spectrometer. The GRS will achieve global mapping of the elemental composition o…