Package xstar

Program that simulates the movement of stars

http://www.schlitt.net/xstar/

XStar is a Unix program that simulates the movement of stars. It starts by
putting a bunch of stars on the screen, and then it lets the inter-body
gravitational forces move the stars around. The result is a lot of neat
wandering paths, as the stars interact and collide.

Along with the program, there is a fairly large document that explains the
N-Body problem in a fair amount of detail. It doesn't get into the gory
details of the "real" N-body solvers, but it does give you an overview of
the techniques they use.

General Commands
Command Description
xstar.1x X11 animated n-body solver