A ring or sphere could, apparently, be stable if surrounded by the right sizes and gravities of other stars.

Copernican armillary sphere from set of two armillary spheres and a celestial globe constructed in paper on pasteboard with metal fitments supported on a decorative mahogany baluster base. Shows ...

Photoshop CS6 Extended tutorial showing how to make a planet and other celestial spheres caught at the instant it explodes into a supernova. Cracked Mud Texture: <a ...