"scott" <sco### [at] scottcom> wrote in message
news:4a264021$1@news.povray.org...
> >   Content of the universe = 10^80 atoms

> > (I can't seem to find an estimate for the number of subatomic particles
in
> > the universe. Since the universe is 75% H, 23% He and only 1% O, I guess
> > there isn't going to be a huge difference - unless you count non-matter
> > particles like photons, etc.)

> I wonder how many photons typically exist?  I mean is it 10^10, 10^50,
> 10^100 or what?  You could probably do some estimate with output power
from
> stars etc.

Googling photon to proton (or baryon, in general) ratio yields about 10^9.

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