Callisto - A Cratered World
Callisto is a satellite covered by a thick crust of ice. The ice has been hit by millions of objects over the years, making craters. There are so many craters on Callisto that you can't make any new ones without wiping out an older one. All of these craters tell scientists that Callisto's surface is very old. Some scientists think that parts of Callisto have not changed in over 4 billion years.
Callisto is also further from Jupiter than any other of the large moons - it is far enough away from Jupiter to be out of the radiation belts!
Keep these things in mind while you discuss your base.
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