Saturn is the 6th planet in the Sol system, the same solar system as Earth. It is a gas giant and the second largest planet in the Sol system. Beka Valentine and Bobby Jensen made a pickup of computer parts on Earth and also picked up Seamus Harper to be a tech on their ship. On the way out of the system to a slippoint, they encountered Nietzschean fighters, hiding behind Saturn, which were dispatched from the occupied Earth. It turns out that the computer parts were actually missiles that Jensen was smuggling but Beka didn't know about. They evaded the fighters by using Saturn's gravity well to do a slingshot maneuver.