The number of objects in the simulation (the " N" in " N-body").The speed at which an N-body simulation can run on a given computer depends on: The object are moved to their new positions, and then the simulation moves on to the next time step. At each time step, the gravitational force acting on each object is calculated, then used to determine how each object will move during that time step. An N-body simulation takes small steps forward in time and looks at how each object affects every other object in the system. Universe Sandbox simulates this motion using an N-body simulation, also known as N-body integration, a computational method used to numerically solve the N-body problem. The mathematical model of a group of objects moving under the influence of gravity (for example, stars and planets moving in space) is known as an N-body problem.
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