Re: Expansion

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Article #4133

#4133

From: RING, DAVID WAYNE
Date: Wed, 30 Sep 1992 01:24

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bweiner@ruhets.rutgers.edu (Benjamin Weiner) writes...
>I think a usual rule of thumb is that if a system is [in the Newtonian
>gravitational approximation] gravitationally bound, it's not
>correct to apply the simple expansion-of-space rule to it.

This makes sense. What I don't understand is why a region of high density
homogeneity does not recollapse in a time appropriate to that density. I.e.
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?

Dave Ring
dwr2560@zeus.tamu.edu

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From: dwr2560@zeus.tamu.edu (RING, DAVID WAYNE)
Subject: Re: Expansion
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