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 and at any speed, as well as move forward or backward in time. SpaceEngine uses pseudo-random numbers to procedurally generate planetary systems, nebulae, and galaxies.

SpaceEngine has no conventional story campaign. Instead, it offers an open-ended journey through a procedurally generated universe, where players freely travel through space and time to explore real and simulated galaxies, planetary systems, and nebulae.