Re: "Real" ringworlds
A bit of background on ringworlds etc.
Niven did write 3 very good books based on a ringworld, including all the physics required etc. Also spawned an RPG and several other books.
It basicly works out that the RW needs to be made of a material as strong as an atomic nucleus (imposisble). To generate gravity its spun at 770 million miles per second around the sun. To do this requires as much energy as our sun produces in several billion years and is therefore impossible. Day/night is generated by panels (Shadow squares) on an inner orbit. Both these panels and the ringworld are not in stable orbits; i.e. if an asteroid hits either panels or RW they would eventually drift and crash into the sun, or each other. This also happens if there is a gravity disturbance, by another planet for example. Corrected by giant thrusters of some sort. Atmosphere is held in by walls 1600 km high at the endge, however if anything punctures the bottom, all the air is forced out and the resuting thrust crashes it into the star. Again.
It has a mass that is only about 350 times that of earth, it is about a million miles wide and about 600 mllion miles long, all habitable. Thats about 3 million earths! Big, very big.
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When a cat is dropped, it always lands on its feet, and when toast is dropped, it always lands with the buttered side facing down. I propose to strap buttered toast to the back of a cat. The two will hover, spinning inches above the ground. With a giant buttered cat array, I could conquer the world.
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