"Anthony D. Baye" <Sha### [at] hotmailcom> wrote:
> Mike Williams wrote:
> > Apart from the absence of the plasma tube, I'd say it was Thistledown.
> >
> > Where does your hollow asteroid get its light from?
> >
> Wow.  Someone else reads what I read.
>
> A.D.B.
>
> P.S. Alain,  Gravity is based on mass.  A sphere the size of earth's
> orbit with a shell thick enough to withstand impacts would naturally
> have a reasonable amount of gravity on it's inside surface.

Actually the gravity felt at a distance underground is that due to the
sphere that you are standing on alone.  Remove that sphere of material and
you are in free-fall.  The easy way to think of this is that a small amount
of material nearby is balanced by a lot at a distance.

Andy

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