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![Technicians examine the Gamma Ray Spectrometer (GRS) before it is moved to be installed on the Mars Odyssey Orbiter in the Spacecraft Assembly and Encapsulation Facility II (SAEF II).; The orbiter will carry three science instruments: the Thermal Emission Imaging System (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 of the surface and determine the abundance of hydrogen in the shallow subsurface. [The GRS is a rebuild of the instrument lost with the Mars Observer mission.] The MARIE will characterize aspects of the near-space radiation environment with regards to the radiation-related risk to human explorers. The Mars Odyssey Orbiter is scheduled for launch on April 7, 2001, aboard a Delta 7925 rocket from Launch Pad 17-A, Cape Canaveral Air Force Station KSC01pp0189](https://cache.getarchive.net/Prod/thumb/cdn2/L3Bob3RvLzIwMDEvMDEvMjQva3NjMDFwcDAxODktNzY3NTI0LTY0MC5qcGc%3D/40/27/webp "Technicians examine the Gamma Ray Spectrometer (GRS) before it is moved to be installed on the Mars Odyssey Orbiter in the Spacecraft Assembly and Encapsulation Facility II (SAEF II).; The orbiter will carry three science instruments: the Thermal Emission Imaging System (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 of the surface and determine the abundance of hydrogen in the shallow subsurface. [The GRS is a rebuild of the instrument lost with the Mars Observer mission.] The MARIE will characterize aspects of the near-space radiation environment with regards to the radiation-related risk to human explorers. The Mars Odyssey Orbiter is scheduled for launch on April 7, 2001, aboard a Delta 7925 rocket from Launch Pad 17-A, Cape Canaveral Air Force Station KSC01pp0189")
