Last updated on April 23, 2014 at 20:10 EDT
Mars Topography
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Mars Topography

August 7, 2012
Color coding in this image of Mars represents differences in elevation, measured by the Mars Orbiter Laser Altimeter on NASA's Mars Global Surveyor. While surface liquid water is rare and ephermal on modern Mars, the topography of Mars reveals large, ancient valley networks and outflow channels. These are evidence that liquid water was more common and played a much more important role in Mars' past. Image Credit: NASA/JPL-Caltech