eli5 how do we know nothing is faster than light?
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We looked at lots of things moving, and saw some strange things happening. Specifically, we did an experiment called the “Michaelson Morley Experiment” that showed, it doesn’t matter what direction you move, or even if you’re moving at all, light you see is always moving at the same speed.
Then, Einstein decided to use that observation to make his theory of relativity. This theory makes a bunch of really weird predictions, like that space and time warp and move in just such a way as to always keep things slower than light.
We are able to test those predictions, and thus far, every single test we have made of Relativity has come back confirming it.
If we find a test that deviates from Einstein’s predictions, then we’ll have to change our theory. But it still has to make the same correct predictions Einstein made, which means it still has to keep objects below light speed.
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