Stock Photo - 03/13/2001 ___ Workers testing in the Spacecraft Assembly and Encapsulation Facility SAEF 2 stand alongside the 2001 Mars Odyssey Orbiter and behind its solar array panels. The arrays of lights right focus on the panels during illumination testing. Scheduled for launch April 7, 2001, the orbiter contains 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 of the surface and determine the abundance of hydrogen in the shallow subsurface. The MARIE will characterize aspects of the near_space radiation environment with regards to the radiation_related risk to human explorers