Gravity Simulator is a Newtonian Gravity Simulation of the interactions between hundreds of small particles in an isolated environment. It has several simulation options to choose from, all based on the same system. At the start of the simulation, clumps of particles are spawned with random velocities, each particle is affected by Newtonian Gravity and clump together as planetesimals. You can press backspace to reset the simulation. The Camera will center towards the global center of mass at all times. The bodies can enter stable orbits, however it is far more common that the majority of mass collapses into one central body and a small amount of remaining mass escapes far away from view never to be seen again.