Space Crash Simulator vs Gravity Physics

Space Crash Simulator models planet collisions the way scientists do. Every planet, moon and star is built from thousands of particles and simulated with SPH (smoothed particle hydrodynamics), the method researchers use to study giant impacts such as the one thought to have formed our Moon. Nothing is scripted: gravity, pressure and heat decide what happens, so every collision plays out differently. SET UP YOUR OWN EXPERIMENT Place up to 8 bodies, choose their size, density, spin and velocity, and see the predicted orbits before you press play. Watch an impact melt a crust, fling debris into orbit and gather it into a new moon, which gets its own trail so you can follow it. OCEAN TIDES An Earth with real oceans: tens of thousands of water particles that respond to the Moon’s gravity. Watch tides flow around the continents, change the Moon’s mass, distance and orbit, and send asteroids into the sea to see the waves they make. GALAXY COLLISIONS Collide two galaxies and watch their stars and gas swirl into tidal tails and bridges before the cores merge into one. MORE TO EXPLORE Protoplanetary disk mode: watch planets form from a disk of dust around a young star Rings, and moons torn into rings by tides inside the Roche limit Black holes with gravitational lensing and accretion disks Heat, lava and cooling crusts after impacts Shapes beyond spheres: cubes, walls, tori, hollow spheres, and your own drawings with the Shape Painter Sample models to collide: Phobos, a Saturn V, a Dyson sphere, the Moai and more Your own photos as planet textures Particle count, accuracy and timescale adjustable to your device PREMIUM No ads, 20 save slots, and a 3D model importer (.glb, .gltf, .obj, .stl, .zip): turn your own models, with their colors and lights, into particle bodies and see how they hold up in a collision. Developed by the creator of Solar System Simulator.

Gravity is a real-time N-body physics simulation of our solar system — fly a spacecraft through accurately modeled orbits, gravity wells, and atmospheres, all rendered in a clean top-down view of the ecliptic plane. Every body uses real physical data: mass, radius, orbital elements, and atmospheric density where applicable. Gravity between all 26 bodies — Sun, planets, major moons, and dwarf planets — is computed live using velocity Verlet integration, so orbits, perturbations, and gravity assists emerge naturally from physics, not scripted paths. FEATURES • Pilot your own spacecraft — configure engine count, thrust, and mass, then launch from Earth • True N-body gravity — every body pulls on every other body and on your ship, in real time • Realistic atmospheric drag and heating — feel the difference between skimming Earth's atmosphere and diving into Venus or Saturn • Time controls — speed up months of orbital motion or slow down to precision-dock in real time • Trajectory prediction — see where your current heading will take you before you commit • Flight trail — trace your path across millions of kilometers • Extended telemetry — track speed, altitude, gravity, thrust-to-weight ratio, dynamic pressure, hull temperature, time dilation, and more Whether you want to attempt a Hohmann transfer to Mars, slingshot past Jupiter, or just watch the Moon orbit Earth in fast-forward, Gravity gives you a physically accurate sandbox to explore the mechanics of our solar system.