Signs of Flowing Water on Mars
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Crater in Arabia Terra Fresh Crater with Light-Toned Ejecta
While most of the new impact craters found on Mars by Mars Global Surveyor have dark ejecta patterns, a few of them also have light-toned ejecta, indicating that the impacting meteorite excavated to a depth where a light-toned material was present. This crater is in Arabia Terra.

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  Jet Propulsion Laboratory
   California Institute of Technology