Jim Devine wrote: > there are large numbers of very small rocks flying around in space. > Don't they explain the cratering on larger rocks pretty well?
and why do we see crates in specific places at specific times. with electrical discharges, what is the charging model that produce a roundish crater *here* and not there at a particular time in the life of a surface. and then there is the impact regolith, the size distribution of particles, and the shape of the crater, its cross-section. there are experiments throwing projectiles at surfaces and looking at the size distribution of small particles and powder created by the impacts, the shape and morphology of the experimental crater. and some matches between experiments and observed craters. are there models for electrical discharge that reproduce the same results? i am aware of detailed calculations of electrostatic charging of powders on the lunar surface, and weak electrical discharges that blow the powder around (maybe even give some of the powder escape velocity), but nothing like discharges that would create them big craters i see when i look up at the moon. google: lunar regolith electric discharges Les