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In the Spacecraft Assembly and Encapsulation Facility 2, workers test the Thermal Emission Imaging System (THEMIS) before attaching to the 2001 Mars Odyssey Orbiter. THEMIS will map the mineralogy and morphology of the Martian surface using a high-resolution camera and a thermal infrared imaging spectrometer. The orbiter will carry three science instruments: THEMIS, the Gamma Ray Spectrometer (GRS), and the Mars Radiation Environment Experiment (MARIE). The GRS will achieve global mapping of the elemental composition of the surface and determine the abundance of hydrogen in the shallow subsurf…
