Mars Saucer Mystery Baffles the Experts

摘要

Planetary geologist Michael Malin brought a long-standing, almost personal, problem to a joint planetary sciences/hydrology meeting session. Despite years of contemplating images returned by his camera now orbiting on Mars Global Surveyor, Malin can't for the life of him figure out how hundreds of impact craters on Mars were filled with some sort of sediment, some to overflowing, and then partially emptied of kilometers' worth of fill. Perhaps the terrestrial geologists in the audience could help?