Real-time planetary collision sandbox powered by SPH physics: smash planets together and watch the destruction and rebirth of new worlds unfold. Space Crash Simulator is a pure sandbox experience where you can design and observe spectacular astrophysical events. Place planets on a grid, set their velocity vectors, and adjust key parameters like particle count, particle mass, viscosity, and spin. Customize each planet with different textures — or use your own images for truly unique worlds. You can even introduce a “black hole particle” with immense mass that tears nearby planets apart. The simulator features several modes to explore different cosmic scales: 2 Body Mode – simple head-on or glancing planetary impacts. 3 Body Mode – chaotic multi-body interactions. Protoplanetary Disk + Star Mode – formation and accretion dynamics. Galaxy Mode – collide entire galaxies and watch their cores dance. (Note: for performance reasons, this mode simulates gravity between galactic centers only, without full SPH fluid dynamics.) Watch as matter melts, merges, and reforms under real physical laws — powered entirely by GPU-based Smoothed Particle Hydrodynamics.