Just a question originating from pure curiosity. But what would happen if we had a large ring in outer-space, akin to the ring world in the game "Halo", so massive that it's minutes from collapsing into a black hole. If it were to uniformly gain mass on all parts of its structure, how exactly would it collapse into a black hole, would it even be spherical in shape? or would the black hole take the form of a ring. I'm just morbidly curious as to what would occur if such an object reached critical densities.