Universe Sandbox is an educational simulator for Windows based computers. It can run scale simulations of our solar system and galaxy while giving you the power to control gravity, time and everything in it.
Smash planets together, introduce rogue stars, and build new worlds from spinning discs of debris. Fire a moon into a planet or destroy everything you've created with a super massive black hole.
It was created with the Truevision3D engine which uses the Newton Game Dynamics physics engine. All of the gravity physics are handled with custom code and I spawn newton physics simulations when bodies get close together to handle the collisions. Load the system: Moons, 75 orbiting Earth and then change the color mode to Color by Physics Group (press the C key to cycle color modes) to clearly see the individual physics simulations.
Watch the 75 second video and download now:
http://universesandbox.com/