Re: A newcomer here

"James A. Donald" <jamesd@xxxxxxxxxxx> wrote in message
news:hou9i1lpbpt6ogfnih6jq7c1v2j1e1nc73@xxxxxxxxxx
> --
> On Sun, 11 Sep 2005 14:29:34 -0700, Brooks Moses
> > Well, it's possible to have a planet with earth-levels
> > of gravity and arbitrarily high mass, so long as one
> > doesn't mind having a hollow planet. (And, at some
> > point way up in the "arbitrarily high" scale, the
> > planet's crust starts becoming remarkably thin....)
>
> If it has earth levels of surface gravity, the crust
> will remain several thousand kilometers thick - though
> this may be remarkably thin compared to the planet's
> size.

Not so. With constant crust thickness and density, the surface gravity
increases as the radius increases. To keep surface gravity constant, the
crust thickness must be reduced as the radius is increased, such that it can
be made arbitrarily thin if you're capable of building something big and
strong enough.

-l.
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