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The Earth Observing-1 (EO-1) spacecraft is the first earth orbiting spacecraft in NASA's New Millennium Program. The New Millennium Program is part of the agency's Mission to Planet Earth enterprise, a series of space missions designed to enhance our knowledge of the Earth and its environmental systems. The EO-1's mission is to employ advanced remote-sensing technologies, including hyperspectral and multispectral imaging techniques, to develop highly accurate terrestrial images. In order to accomplish this mission, the spacecraft contains three primary instruments: Advanced Land Imager (ALI), Atmospheric Corrector, and Hyperion. The bus supporting these sensors is part of a 3-axis stabilized, nadir pointing spacecraft that employs an articulating solar array to provide a constant voltage, regulated power bus. EO-1 also contains several new technologies such as a carbon-carbon radiator and a pulsed plasma thruster that will be verified as part of the secondary mission objectives.