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> 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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