> The question doesn't make sense to ask. If you didn't look at the photon,
> it might or might not have existed.
You can estimate the number of photons coming off a star though, can't you?
Just multiply that figure by the estimated number of stars in the entire
universe and that's a start for the lower bound.
> There's probably some statistical thing that'll tell you some expected
> numbers, but it's not really the same question.
Well that's why I said "typically" rather than asking for an exact number
:-)
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