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For questions about "Known Space". It is the name given to the fictional universe and setting where many of Larry Niven's most popular novels take place, including his classic Ringworld.

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Instability of Niven's ringworld

I've read that the ringworld's design is actually unstable, and that it would drift and eventually collide with the star it was supposed to orbit. How is this flaw corrected in the subsequent stories? …
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