Large Impact Craters on Ceres Have Gone Missing

Scientists have found a bit of a mystery at the dwarf planet Ceres. Yes, there are those intriguing bright spots inside numerous craters, which is a mystery that has mostly been solved, being made of bright salts, likely leftover from a briny solution of sodium carbonate and ammonium chloride. But a new puzzle involves the craters themselves. In the rough and tumble environment of the asteroid belt, ancient Ceres was certainly pummeled by numerous large asteroids during its 4.5 billion-year life...