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From what I gather, even the proton has a probability to break apart after however long.
Is this valid for photons as well? Supposing they did decay, then would there be a second "cosmic event horizon" by which light from a certain distance can't reach us regardless of time?
Is this valid for photons as well? Supposing they did decay, then would there be a second "cosmic event horizon" by which light from a certain distance can't reach us regardless of time?