Rotating c. 2x / minute...

Many interations of designs and many variations on these mammoth space cities have been hypotheized.

Gerhard O'Neill's, High Frontier, provides the engineering that made them possible to build thirty years ago. This one has a population capacity breaking 100,000.

Original studies alongside O'Neill's from the 1970s and 80s found this place would need regular supplies from Earth or the moon, but more recent research into using NEO resources and the discovery of water on the moon lessen and possibly remove the habitat's need for regular supplies.