Boulder saturation

Second look at the LROC Featured Image, from LROC Operations Center, Arizona State University, May 20, 2010 - close up of a 'house-sized' bolder and the end of its bouncing trail, angling back into a worn crater - coming to a halt millennia ago. The 200 meter wide field of view from the interior a large crater situated in still larger 42 kilometer-wide Henry Frères (23.39°S, 301.06°E). ("Hole in one, in a hole in one," Lillian Ostrach, from LROC NAC M122597190L - LRO orbit 3200, March 7, 2010; alt. 46.24 km; res. = 0.50 meters) [NASA/GSFC/Arizona State University].The history of the Moon is a history of bombardment. From the global to the micro-scale the history of the Solar System has been etched in detail with little erosion other than subsequent bombardment. Other than the splash, relatively brief flow and inundation of melted material, most of the resulting debris has been broken rock, in sizes ranging almost as wide in scope as those of the Moon's craters.Fortunately, most of this debris has been shattered and shattered again, gardened into pieces small enough to become packed down by micrometeorites, and the Moon turned out to be perfectly safe to walk on. Like ...