Re: Expansion

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Article #4236

#4236

From: Benjamin Weiner
Date: Wed, 30 Sep 1992 19:34

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dwr2560@zeus.tamu.edu writes:
>if the universe were filled with stars, in the density of a galaxy, the
>universe would have recollapsed long ago. The region of space which is
>inside a galaxy satisfies the same local einstein equation as the above
>recollapsing example, so why do galaxies live so long?

Boundary conditions, no?  The galaxy is attached to a lot of less-
dense space surrounding it.

Certainly the curvature of space across a galaxy is negligible
(in our universe, anyway).  Across an entire universe filled with
stars, it's not.

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References: <1992Sep29.040437.6678@cid.aes.doe.CA> <Sep.29.16.54.08.1992.28530@ruhets.rutgers.edu> <29SEP199220244986@zeus.tamu.edu>

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Path: arc1-ca.pugleaf.net!sparky!uunet!dziuxsolim.rutgers.edu!ruhets.rutgers.edu!bweiner
From: bweiner@ruhets.rutgers.edu (Benjamin Weiner)
Newsgroups: sci.physics
Subject: Re: Expansion
Message-ID: <Sep.30.15.34.07.1992.14405@ruhets.rutgers.edu>
Date: 30 Sep 92 19:34:07 GMT
References: <1992Sep29.040437.6678@cid.aes.doe.CA> <Sep.29.16.54.08.1992.28530@ruhets.rutgers.edu> <29SEP199220244986@zeus.tamu.edu>
Organization: Rutgers Univ., New Brunswick, N.J.
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