Why have we ruled out the possibility of finding something faster when we’ve only scratched the surface of space exploration and understanding?
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The proper term for this is the speed of causality (the “c” in E=mc^2.
The speed of causality is the fastest speed at which any energy can propagate, and is a fundamental property of the universe (meaning there is no simpler explanation).
It just so happens that light propagates at the speed of causality, which is why we call it the speed of light.
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