A ring world was like a Dyson sphere, but shaped like a ring instead of being completely spherical. Safeplace was a ring world about 32,000 light-years from Mars. A segment of the Key to Time took the form of a castle where the Valdigians negotiated on Safeplace. (AUDIO: The Judgement of Isskar)

Behind the scenes Edit

The concept was invented and used in Larry Niven's novel Ringworld, as well as subsequent books in that series.

Community content is available under CC-BY-SA unless otherwise noted.