eli5 how do we know nothing is faster than light?
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Everything moves at the same speed, and we call that speed “c”. It’s just that we don’t just move through space, we move through time. So, we’re all moving through “spacetime”. The faster we move through space, the less speed is available to move through time. Light travels through space at c so doesn’t move through time at all.
It’s not like there is slow and fast, because we all move at the same speed, just in different directions, and one of those directions is time.
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