They are primitive un-evolved bodies, so by studying these bodies we can learn more about how the solar system came to be in a way that's not otherwise possible.
They don't make them like that anymore. The standard size was 30 feet, but for some reason they built it 10 meters, or 33 feet.
There's a touch screen where you can assemble snippets into a mini-show. Imagine you go to a jukebox and punch in a number of tapes, and it plays your show.