This outer material, called regolith, is created over time, as tiny impacts pulverize the surface of each particle. (sciencedaily.com)
Without atmospheres to slow and stop tiny impacts, the surfaces of these small worlds are repeatedly sand - blasted by all manner of space debris. (public.nrao.edu)
Of more interest, is the incredibly tiny impact the cutting 83 % of U.S. emissions has. (c3headlines.com)