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Science-Fiction Adventure in the Far Future
Ringworld

An incredibly strong band could be set rotating about a central star, making a ringworld that uses centrifugal force to provide a simulation of gravity.

A ringworld with a radius of 148 million km (93 million miles) and a width of 1.6 million km (1 million miles) would have a usable surface area equal to three million planets the size of Terra (1827 Solomani Rim).

cf, Planetoid, Rosette.

Refs: BOOK-3, 1105