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Last updated on April 23, 2014 at 21:24 EDT
Nechos Terraces
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Necho's Terraces

December 4, 2012
What's causing this asymmetry? It appears that Necho formed on the rim of an older, highly degraded crater. The western half of Necho crater formed rather normally, but the eastern half was affected by this preexisting topography. The walls on that side of the crater were lower, which allowed huge flows of impact melt to spill from the crater, as seen in this past featured image, and will be highlighted again in tomorrow's image. Necho's serendipitous formation at this site resulted in an extra-beautiful lunar crater. WAC monochrome image of Necho crater (30 km in diameter) and the location of the NAC mosaic above. Image M119048299M. Credit: NASA/GSFC/Arizona State University.