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Article #4585Re: Number of elementary particles in visible universe?
From: Marko Amnell
Date: Mon, 05 Oct 1992 10:28
Date: Mon, 05 Oct 1992 10:28
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1163 bytes
In article <1992Oct5.010024.7629@hellgate.utah.edu>
tolman%asylum.cs.utah.edu@cs.utah.edu (Kenneth Tolman) writes:
>What is the approximate number of elementary (I mean proton, electron,
>neutron) particles in the visible universe? Is it around 10^40, or
>way higher?
It's way higher. More like ~10^80 (in a typical cosmological model).
On p. 1216 of MTW there are two 'big numbers' listed of about the size
you mention.
10^40 ~= 10^28 cm/10^-12 cm (radius of universe at maximum
expansion)/(`size' of elementary particle)
10^40 ~= e^2/GmM (electric forces)/(gravitational forces)
Maybe you were thinking of one of these.
--
Marko Amnell
amnell@klaava.helsinki.fi
Graduate Student in Philosophy
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Path: arc1-ca.pugleaf.net!sparky!uunet!mcsun!news.funet.fi!hydra!klaava!amnell From: amnell@klaava.Helsinki.FI (Marko Amnell) Newsgroups: sci.physics Subject: Re: Number of elementary particles in visible universe? Message-ID: <1992Oct5.102847.21823@klaava.Helsinki.FI> Date: 5 Oct 92 10:28:47 GMT References: <1992Oct5.010024.7629@hellgate.utah.edu> Organization: University of Helsinki Lines: 22