A recent set of satellite photos from a Moon crater twice as deep as the Grand Canyon . Details here. If you go here, you can even zoom in to see your favorite boulder.
“Twice as deep as the Grand Canyon and 26 miles wide, Aristarchus was created when an asteroid hit the moon approximately 450 million years ago. The impact excavated deep into the lunar crust and produced dark clumps and streamers of pyroclastic ash—glasses formed during fiery eruptions similar to those in the Hawaiian Islands. Ledges seen on the wall are topped with sagging blocks of pre-impact lunar crust.”
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