We had known each other for only two or three months and they opened up their homes.

In essence, we were a fraternity. We'd all go to the cafeteria and the library together. It was kind of comical, but we were all good buddies.

We've all kind of matured. Other than that, it's still the same. No one comes with airs.

We don't want to be hauling cement to Mars. That's very expensive. Better to know what we can make on the surface of the planet.

Now with the new images, we're able to watch when the frost comes and goes and we can see that dunes are moving today and aren't just relics from times past.

These are some of the highest regions of the planet because they sit on top of southern hemisphere terrain, which is higher than corresponding terrain in the north.