Lying within Mare Fedunditatis (Sea of Fertility), the two craters Messier and Messier A can be seen at the centre of this image (Messier is the left one). Taken around midnight on 13th January 2009, with the moon around 16 days old, the characteristic ejecta plume shows well emanating towards the south west of the pair.

They are referred to as pristine craters because they exhibit none of the usual signs of deterioration, such as slumping crater walls, other crater impacts or basaltic lava fl...
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