Oct 012020
The classic Niven version, as rendered a full decade ago. You know, in the “before times.”
Bonus:
in short: ringworlds are damned impressive megastructures that, unfortunately, cannot be made from any known material or any reasonably conceivable material. The general description is that the structural material would need to have tensile strangth about that of nuclear force holding atomic nuclei together. If you can handwave *that,* here’s a way to build a structure with the surface gravity, temperature and atmospheric pressure of Earth, but with three million times the livable area.