From: Emlyn O'regan (oregan.emlyn@healthsolve.com.au)
Date: Thu Aug 15 2002 - 18:11:01 MDT
The balloon model stinks because the dots expand as well as the space
between. So from the point of view of a dot, there is no expansion (hmm kind
of).
What that model implies to me is that there would be no integrity in small
local systems; all *atoms* would move away from each other, with disastrous
results.
The dough analogy seems better. We assume infinite dough, yes? :-) So
expansion is really a statement about density, not overall size?
Am I correct in assuming that the raisins remain raisin sized regardless of
expansion, which is a metaphor for galaxies, solar systems, small objects
staying cohesive due to local forces (gravity, nuclear forces)?
So this whole business about the expanding universe and the cosmological
constant is about whether everything falls toward everything else quicker or
slower than space is added between? And consensus now is that it doesn't?
Rather, like a nightmare where you try to run somewhere but seem to get
further away, gravity is not enough to overcome this constant (or
accelerating!) influx of space?
Does this mean that all the local forces, ie: the nuclear and
electromagnetic forces binding the little things, are acting against this
influx of space too?
Emlyn
> -----Original Message-----
> From: Eugen Leitl [mailto:eugen@leitl.org]
> Sent: Thursday, 15 August 2002 22:23
> To: extropians@extropy.org
> Subject: Re: Nature Article
>
>
> On Thu, 15 Aug 2002 Spudboy100@aol.com wrote:
>
> > The balloon analogy, that astronomers frequently use,
> really stinks. Why?
>
> Not really, because the rubber skin is meant to be a 2d model of the
> universe. If you want a 3d analogy, think dough with embedded raisins
> increasing volume due to yeast's carbon dioxide. The average distance
> between each raisin increases.
>
>
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