On 9 May 2020 at 20:38, Richard Aiken wrote:

>
> On Sat, May 2, 2020 at 6:05 AM shadow at shadowgard.com (via tml list)
> <xxxxxx@simplelists.com> wrote:
>     Any holes from one side to the other are gonna be fun too. The
>     gravity in them will probably drop linearly from 1 g at either end
>     to zero g in the middle.
>
> I would think that instead of getting zero at the middle, you'd get a
> region of the hole wall that had at least one gravity, probably more.
> After all, you've got the mass of the rest of the disk pulling
> *sideways* on you all the way down. Unlike in the case of a globe,
> this pull would progressively get stronger than the downward pull,
> as you went deeper. You might even be able to build a (mostly)
> counterweight-powered elevator/railroad between "Centerville" and the
> surface of each side.

Those sideways forces have to be neutralized somehow or the disc
collapses into a sphere and then becomes a *large* black hole.

Also, you've got *millions* of miles of rock on all sides of the
hole. They'd mostly neutralize each other. Of course "mostly" isn't a
lot of help with masses that large. But again *something* has to
neutralize them fr the disc to exist.
--
Leonard Erickson (aka shadow)
shadow at shadowgard dot com