The Sol System
The Sol System is the system of planets and other spacial objects orbiting the star Sol in the center of the system. It's planets include Venus, Mars, Earth, Astarte, Mars, Jupiter, Saturn, Uranus, Neptune, Quinox, and Nemesis. There is an asteroid belt between Mars and Jupiter--a remnant of the exploded planets Kantek and Eden--where Ceres, Juno, Pallas and Vesta reside (among thousands of other objects). Beyond Neptune is the Kuiper Belt, a disk shaped region between 30 and 50 AU from the sun. Beyond this is a halo of cometary objects known as the Oort Cloud potentially containing trillions of objects and extending at least 50,000 AU from the sun.
While Earth is currently the only planet supporting Human life, all the planets once did during the Silver Millennium. Raihosha's ship Aescapulus is parked somewhere in the Kuiper Belt.
