> I appreciate it could be difficult to do but it would be a good challenge.
> 
> You do not need to compare every particle with every other particle as most
> will be outside the gravitational field. I do not know the maths behind it
> but I do know that the gravitaitional field drops off the further you get
> from an object (thus making the math more difficult).

But it doesn't drop to zero IIRC...

Bye for now,
     Jamie.

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