How Old are Martian Gullies?

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Gullies eroded into a high middle slope of an impact void during this plcae seem ideally primitive in this picture prisoner by NASA’s Mars Reconnaissance Orbiter (MRO). Although during initial peek it might seem that there are craters superimposed on a gully fans, investigation of HiRISE stereo coverage shows that a craters distortion usually on a pre-gully terrain.

Distinctive colors in a gully channels and alcoves offer another denote of girl and new activity. The pre-gully landscape is lonesome by delegate craters from circuitously Gasa Crater, estimated to be about 1 million years old. Although some have suggested that a Martian gullies are also about a million years aged and shaped in a opposite environment, we now know that they are stability to form today.

The map is projected here during a scale of 50 centimeters (19.7 inches) per pixel. [The strange picture scale is 50.8 centimeters (20 inches) per pixel (with 2 x 2 binning); objects on a sequence of 152 centimeters (59.9 inches) opposite are resolved.] North is up

The University of Arizona, Tucson, operates HiRISE, that was built by Ball Aerospace Technologies Corp., Boulder, Colo. NASA’s Jet Propulsion Laboratory, a multiplication of Caltech in Pasadena, California, manages a Mars Reconnaissance Orbiter Project for NASA’s Science Mission Directorate, Washington.

Source: NASA

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