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Originally Posted by Tom Kalbfus
I started this thread in THS, but perhaps it is entirely separate. Basically it is a ringworld that doesn't use rubber physics or Superscience, it is 1,000,000 miles wide, 93,000,000 miles in diameter and centered around our own Sun and in our own Solar System in the future, and it is in the deep future.
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You're going to need either rubber physics or superscience to explain what the ring is made of that's strong enough to withstand the tension its under. Niven invented scrith, which is an impossible material, to do the job in Ringworld.