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The Stanford Torus was the principal design considered by the 1975 NASA Summer Study. It consists of a torus or donut-shaped ring that is one mile in diameter, rotates once per minute to provide Earth-normal gravity on the inside of the outer ring, and which can house 10,000 people. It’s a self-enclosed torus 1.8 kilometers in diameter, and would rotate once per minute to provide its 10,000 inhabitants with 1.0g of gravity. An inner ring is connected to the outer ring with a series of spokes, and provides sunlight set up with a system of mirrors, which provide light to...