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Following up on a recent prior post under a different subject, I would like to know why the speed of light is what it is. I'm not talking about its constancy or its value based on whatever units of measure are chosen, but rather, I am asking what are the factors in the universe that limit its speed to any value? To rephrase, we know that the speed of objects with mass is limited to lightspeed, but what limits the speed of light itself?