Origins of the South Pole-Aitken Basin
Despite the size of the South Pole-Aitken Basin, most scientists agree that it is unlikely that the crater was caused by a large meteor traveling at a high velocity when it collided with the Moon. This is because the depth of the crater at the basin is not deep enough for such a scenario to have taken place. Instead, most astronomers now believe that the crater was created by a meteor traveling at a relatively low velocity that struck the southern pole of the Moon at a very low angle. A collision like this would account for the wide diameter of surface damage that the was created by the impact, as well as the low depth of the crater itself.