Re: Electrons in the universe
- From: Sam Wormley <swormley1@xxxxxxxxx>
- Date: Tue, 07 Feb 2006 18:18:38 GMT
madscientist5500@xxxxxxxxx wrote:
How many electrons are there in the universe and how can this number be
calculated? Thanks.
The WMAP data give the most precise values for the density of ordinary
[baryonic] matter made of protons and neutrons: 0.4 yoctograms per cubic
meter, and for the total of dark and baryonic matter: 2.5 yoctograms per
cubic meter. These correspond to omega_b = 0.0224 +/- 0.0009 and
omega_m = 0.135 +/- 0.009.
Since the universe is electrially neutral, you can use this data to
estimate the number of electrons.
.
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- Electrons in the universe
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