Eli5: Why does light travel so fast?
In: 130
The real question is why does light travel so slow.
Light always travels as fast as it can. It just turns out that “as fast as it can” in a vacuum puts it right up at the natural speed limit of the universe, the speed of causality. So the speed of light is not actually the speed of light. It’s the speed of causality.
The real question is “why is the speed of causality a thing.” And the answer, unfortunately, is we have no idea.
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