eli5 how do we know nothing is faster than light?
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It’s not that things can’t go faster than light – it’s that everything in the universe moves at exactly the same speed, all the time. That speed is the speed of light.
There is only the one speed. Nothing moves faster *or* slower. The proportion of that speed that is expressed as motion through space and motion through time is all that changes.
If something is moving with all of its speed through time, it doesn’t move through space. If something moves with all of its speed through space, it doesn’t move through time.
We noticed that light moves with all of its speed through space and none through time, so we named the universal speed after it. But don’t let the name fool you – you’re moving at the speed of light as well.
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