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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It’s not. Particles with mass take energy to accelerate. Massless particles, don’t. Massless particles will move at a certain speed, and light is one of them, but not the only. Particles with mass can’t move above that speed, since they would require infinite energy to accelerate to it. Something that moved faster than than the speed at which massless things move would need to have negative mass. As far as we know, that doesn’t exist.
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