Rendered in August of 2017 for the Ringworlds episode of SFIA.
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Ringworld was a novel written by science fiction author Larry Niven in 1970, featuring a setting placed on a ring-shaped megastructure surrounding a star's habitable zone. Gravity was provided by centrifugal acceleration through the ring's spin, and day/night cycle was provided by large orbiting solar shade panels. The whole structure was only stable due to the super-materials the book described, with unrealistically high tensile strengths.
The Science and Futurism with Isaac Arthur episode on ringworlds details not only this specific ringworld, but variations on the idea which are more practical and realistic.
https://en.wikipedia.org/wiki/Ringworld
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