"Chris Huff" <chr### [at] maccom> wrote in message
news:chr### [at] povrayorg...
>
> Those *are* black holes...he's using the equations for a point source, a
> singularity. Spherical masses with a radius larger than 0 don't have
> this falloff...unfortunately, I don't know the equation for the
> gravitational force of a spherical body.

Maybe these web pages have the answer, I sure don't.

http://www.ac.wwu.edu/~vawter/PhysicsNet/Topics/Gravity/AccOfGravity.html

Have a look at the gravitational force link there too.

Bob H.

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