Surprisingly, some Dyson spheres and ringworlds can be stable
Surprisingly, some Dyson spheres and ringworlds can be stable

phys.org
Surprisingly, some Dyson spheres and ringworlds can be stable

Surprisingly, some Dyson spheres and ringworlds can be stable
Surprisingly, some Dyson spheres and ringworlds can be stable
iirc, Niven once said he had to do so many Ringworld sequels because those meddling kids kept noticing problems with the science. In the first sequel he added ramjets to the edges to help with stability.