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TARDIS Index File

Ring world

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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.

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