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From: cjh@petsd.UUCP (Chris Henrich)
Newsgroups: net.physics
Subject: Re: Re: Big Bang Impossible
Message-ID: <394@petsd.UUCP>
Date: Tue, 11-Dec-84 19:43:56 EST
Article-I.D.: petsd.394
Posted: Tue Dec 11 19:43:56 1984
Date-Received: Wed, 12-Dec-84 06:21:21 EST
Organization: Perkin-Elmer DSG, Tinton Falls, N.J.
Lines: 40

[]
> > If the whole universe was ina speck, said spec would have been a black hole
> > and the "big bang" could not happen.  No one has yet disputed this. Why not?
> 
 perhaps it reached critical mass and exploded?  :-)

:-) So the universe was inside a black hole, and nothing could 
:-) escape... as far as I can see, nothing *has* escaped;
:-) everything is still inside the same black hole. It's just a
:-) bit roomier now...

     When cosmologists say that "in the beginning" the
universe was in a speck, they mean to say not only that all
matter was concentrated into a tiny volume, but also that this
volume contained all there was of space.  Today the radius of
the universe, if it is finite and well-defined, is billlyuns
and billlyuns of light years; for many purposes, "infinity"
(and the universe is flat). 
     Here is an analogy that is not too bad: imagine a rubber
baloon, painted black with white spots.  Let the baloon
inflate; then the white spots move apart from each other.
Initially, when the baloon is very small, the spots are 
close together; if the baloon was the size of a "speck", then
all the spots were crammed together in a speck.
     This expanding, spherical universe is quite different
from the Schwarzschild solution of the Einstein equations
which is commonly known as a "black hole." One difference is
that the black hole is a stationary or slowly changing
configuration, whereas the expanding universe clearly is
rapidly changing.


Regards,
Chris

--
Full-Name:  Christopher J. Henrich
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