I jsut put together a simple gravity simulation of my own using
(gravconstant)/d^2.  There are no colisions and all the points are of the
same mass (that's why I don't need to multiply by the masses) and was having
the ame problem with stuff being shot off into space, but I found an
interesting solution.  If I only calculate the effects of gravity if the two
objects are some distance from each other, the whole thing sticks together
very nicely.  Some particles do drift off at a low velocity, but I suspect
they would come back in time.  I know this is kind of cheating, but it looks
pretty descent, a lot better than having particles shoot off into space
seemingly at random.

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