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SpaceSim is a simulation and rendering software that uses Smoothed Particle Hydrodynamics (SPH) to model collisions of celestial bodies, accretion disks around black holes, and the formation of galaxies in the early universe. It is developed and published by Pavel Ševeček and is offered on Steam as Early Access, inviting community feedback and collaboration. The current Early Access version focuses on GPU-accelerated solvers and continued feature development to align CPU and GPU capabilities ahead of a fuller release.
AI named SpaceSim in January 2026.