> That would be a lower bound on the non-virtual photons, yes.  Of course, 
> there are heptazeptazillions of photons deep inside each star being 
> created and destroyed. It takes about a million years for a photon created 
> in the sun to actually get to the surface. Count those?

Well if we know the rate of photons coming off the star, and each one has 
lived for a million years previously, then you could make some estimate.

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