Last updated on April 17, 2014 at 10:36 EDT
MiLong Dry Spell
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MiLong Dry Spell

October 20, 2009
Data from the Thermal Emission Spectrometer instrument on NASA's Mars Global Surveyor showed exposures of olivine-rich rocks, which were mapped in more detail by the Thermal Emission Imaging System on Mars Odyssey. Here colors ranging from magenta to purple-blue trace large exposures of olivine-rich rocks in the Nili Fossae region of Syrtis Major. The images from the Thermal Emission Imaging System show that the olivine is about four times as extensive as scientists previously thought. This image is about 350 kilometers (220 miles) wide.