The reflectance difference has two possible causes. The two ejecta streaks could be from separate craters, or the ejecta could be the result of compositional differences in the target rock. Since both ejecta streams point back to the unnamed crater, the ejecta contrast is most likely the result of a compositional difference in the subsurface. Since the context map shows that the higher reflectance ejecta is much more prevalent, a small lower reflectance rock layer is probably the culprit.
Can you find any other low reflectance boulders or ejecta in the full NAC frame?
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Published by Drew Enns on 22 November 2011