Linne' Crater

Linne' Crater is small by lunar standards, but scientists have decided it's nearly perfect.  Because it's relatively young, it's also nearly pristine, so scientists can use it as a model for how impact craters form.  There are impact craters on Earth and Mars, but they are distorted by time and weathering.  Lunar craters are much less bothered by weathering, as the Moon has virtually no atmosphere.

By studying Linne' up close and comparing it to craters on other worlds, astronomers hope to not only tease out broad principles about impacts but also to learn about the history of those worlds by noting how far impact craters on them are from perfection.