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Crater in Mare Humorum
05.24.11
 
This crater, located in Mare Humorum, is relatively fresh and very bouldered › View larger image
This crater, located in Mare Humorum, is relatively fresh and very bouldered. LROC NAC M157851844LE, image width is 500 m [NASA/GSFC/Arizona State University].


Why is this crater so bouldered? Bouldery craters are primarily the result of bolides impacting solid material. More cohesive materials produce larger boulders when they are impacted. Craters like these can give clues as to the thickness of the regolith. As craters increase in diameter, they excavate further into the surface. So if a crater has no boulders, it has probably excavated only regolith. This impact though has punched through the overlying regolith and fragmented the underlying mare basalt into large boulders

LROC context image of today's featured image, located in the white box › View larger image
LROC context image of today's featured image, located in the white box. Image width is 100 km [NASA/GSFC/Arizona State University].


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http://wms.lroc.asu.edu/lroc_browse/view/M157851844