+Topography+of+Mars.jpg)
+Topography+of+Gale+Crater.jpg)
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.
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