When carbon buckyfibre cable became readily available through nanofacturing techniques, the size of rotating habitats could be increased considerably. The largest rotating habitats possible using this material can be slightly more than one thousand kilometers in radius. In the Information Age Forrest Bishop proposed a ring-shaped open ended habitat, with the atmosphere retained by centrifugal force and tall atmosphere walls. Any stray molecules of air which might wander out of the ring could be recovered by a very thin membrane, preferably transparent.
In most versions of the Bishop Ring design the local star is permanently obscured from the point of view of someone standing on the ring-floor; this means the ring requires artificial lighting, generally provided by a central artificial sunlet called a luminaire. Power for this luminaire can be collected by photovoltaic cells on the outside of the ring; if the ring is distant from the star, the p-v arrays can be extended beyond the ring floor in both directions, and/or other sources of energy can be utilised.
Tech Level: Stringtech 5, Nanotech 4