Gargantua is a supermassive black hole that acts as the 'sun' for its surrounding system, as depicted in Christopher Nolan's Interstellar.
Light and warmth are provided not by nuclear fusion, but by the friction of the massive accretion disk. The system is famous for its extreme gravitational time dilation and the mysterious 'Bulk'—a five-dimensional gateway back to our own Solar System.
A supermassive black hole spinning at 99.8% of the speed of light. Its massive accretion disk provides the only light and heat for this system.
A shallow, endless ocean world sitting dangerously close to the singularity. Because of intense gravitational time dilation, one hour here equals seven years on Earth. Those aren't mountains...
A frigid, desolate ice world wrapped in ammonia clouds. A monument to human cowardice and the instinct for survival.
A breathable, rocky desert world further out from the black hole. A quiet, lonely place to start over.
A spherical, stabilized Einstein-Rosen bridge leading back to the Saturn system. They didn't put this here. We did.