>   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.

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