Universe Sandbox is a realistic physics-based space simulator that allows you to create, destroy, and interact on an unimaginable scale.It merges real-time gravity, climate, collision, and material interactions to reveal the beauty of our universe and the fragility of our planet. Simulate GravityN-body simulation at almost any speed using Newtonian mechanics. Real science, real physics, no supercomputer required. Collide Planets & StarsEpic, mind blowing collisions of massive planetary bodies that leave behind molten craters.Create Your Own SystemsStart with a star, then add a planet. Spruce it up with moons, rings, comets, or even a black hole.Model Planetary ClimateWatch sea ice grow and recede with the seasons because of a planet’s tilt - change the tilt and change the seasons. Or move planets close to a star and see the oceans boil away as the surface heats up. Supernova a StarWatch a supernova unfold by colliding two stars, cranking up their mass, or making them explode at your whim.Explore Historical EventsHitch a ride with spacecraft including Juno and New Horizons, or view a total solar eclipse. And more...Build and terraform planets with 12 materials, including water, oxygen, & carbon dioxideStellar flares & volatile trailsProcedurally generated planets, stars, & galaxiesPulsarsLight-warping black holesEpic space lasersShape oceans & mountains on planet surfacesSpin planets apart with centrifugal forceOriginal soundtrack by MacoubreSupport for 20+ languagesShare & explore simulations on Steam Workshop