Jeg fant den linken svært lite opplysende, TS sitt konsept er mye nærmere det som er beskrevet av Arthur C. Clarke i https://en.wikipedia.org/wiki/3001:_The_Final_Odyssey

Now let's see why this doesn't apply to rings. Again we have the same kind of situation, with an off-center test particle (again, because the centered case is trivial) and a double-cone, although now since we're effectively dealing in two dimensions, it's more like two sectors of a circle. Now the area intersected by each sector is only proportional to r, while gravity is still proportional to 1/r2. Now you get a situation where the gravitational attraction of each portion is not independent of distance; it varies as 1/r. That is, the closer side will attract you more strongly than the further side. Put a test particle off-center in the ring, and it will crash itself against the ring. Because of Newton's third law, put an object more massive than the ring itself off-center in there and the ring will smash itself against it.