From: Reason (reason@exratio.com)
Date: Mon Feb 10 2003 - 00:33:41 MST
One could also mention the gembox cosmologies that just *look* like they
have an infinite number of galaxies in them. Small closed universes in which
any given point can be seen from all directions from any other point (or
topological subsets of the same). I think that's just a curio, though. Or at
least no-one was putting anything serious forward last time I looked.
Reason
http://www.exratio.com/
> -----Original Message-----
> From: owner-extropians@extropy.org
> [mailto:owner-extropians@extropy.org]On Behalf Of Ramez Naam
> Sent: Sunday, February 09, 2003 10:40 PM
> To: extropians@extropy.org
> Subject: RE: Cosmology Question
>
>
> From: Anders Sandberg [mailto:asa@nada.kth.se]
> > I think most cosmologists think of spatially
> > unbounded universes when they consider the open
> > universe scenario (although it is not topologically
> > required). These would have an infinite number of
> > galaxies, although I don't think this is widely
> > remarked on.
>
> Really? I'm no cosmologist, but this doesn't jive with my
> understanding. An open universe is one that will expand infinitely
> and is therefore *eventually* infinite in volume.
>
> However, an open universe has finite mass, which clearly limits the
> number of galaxies. Indeed, if an open universe had an infinite
> number of galaxies it would have infinite mass, which would result in
> a mass density that would guarantee collapse, thus implying a closed
> universe.
>
> Or at least, that's how this non-specialist sees things.
>
> mez
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