apollo astronauts did in preparation for their mission. >> they have to try to replicate with this like on the south pole of the moon. where the sun is very low, right in your eyesight. everywhere else in this pitch black. >> nasa believes there is water ice on the south pole. a potential source of drinking water and rocket fuel. when it is, colder with less sunlight, this is the deputy tree chief of the pole land. >> this has a dusk lighting, and the behind any kind of large rock or things like that, it's just going to be very dark. >> certainly easier to drive when you are in the sunlight, absolutely. those shadows are so long. >> already, astronauts are using simulators to practice driving a rover on the moon. >> astronauts need to learn how to drive a rover without going into one of their holes. >> that's correct. you very often don't know how deep these trains are. it is difficult to tell how big