Ganymede

Ganymede is Jupiter's largest moon and is the capitol of the Jovian Alliance. First colonized by man on 2064, it grew into a waystation, a rest stop between the inner and outer Solar System. It is a major stop for tourists and exports nanofibres. Ganymede boasts a massive population of 750 million with an additional 8 million in orbit. Sapient2 cities have been discovered on it.