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From: Hatunen on 25 May 2010 13:29
On Mon, 24 May 2010 18:30:09 -0700 (PDT), Brad Guth
<bradguth(a)gmail.com> wrote:

>On May 24, 10:48�am, Hatunen <hatu...(a)cox.net> wrote:
>> On Mon, 24 May 2010 04:45:42 -0700 (PDT), Brad Guth
>>
>> <bradg...(a)gmail.com> wrote:
>> >The shell can be several thousand miles thick, and layers of it can be
>> >liquid or even compressed gas. �Inside of this thick shell is still
>> >zero or negative gravity.
>>
>> The gravitational field goes to zero at the center of a sphere,
>> but the pressure there is is the sum of the pressure of all the
>> gravity affected material above it.
>>
>Unless the hollow sphere itself is no longer shrinking in volume, and
>subsequently the thick shell acts as a sufficient pressure hull that
>can be vented or pumped out.

I guess one can always conjure up incompressible and rigid
substances. It's coomon in simplified physics explanations.

--
************* DAVE HATUNEN (hatunen(a)cox.net) *************
* Tucson Arizona, out where the cacti grow *
* My typos & mispellings are intentional copyright traps *
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