In article <3d9710d0@news.povray.org>, war### [at] tagpovrayorg says...

>   Orbits caused by gravitational or magnetic forces are very very
> unstable.

This is only true for systems with three or more bodies.
A system of two bodies will always be stable I think (in real life, a 
simulation of it may be unstable, especially if computed using the Euler 
algorithm).

Lutz-Peter

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