土卫一：有大撞击坑的小卫星
2021年05月31日 Mimas: Small Moon with a Big Crater Image Credit & Copyright: NASA, JPL-Caltech, Space Science Institute, Cassini Explanation: Whatever hit Mimas nearly destroyed it. What remains is one of the largest impact craters on one of Saturn’s smallest round moons. Analysis indicates that a slightly larger impact would have destroyed Mimas ent...