SpaceEngine

SpaceEngine is a 3D astronomy program and game engine developed by Russian astronomer and programmer Vladimir Romanyuk. Using real astronomical catalogs and procedural generation, it creates a three dimensional planetarium representing the entire universe. Users can travel through space in any direction or speed, and forwards or backwards in time. It uses pseudo-random numbers to procedurally create any kind of planetary system, nebula or galaxy.

SpaceEngine is a simulation/action game available on PC.