eli5 how do we know nothing is faster than light?
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It appears that space and time are the same thing, which we refer to as spacetime. It also appears that everything moves through spacetime at light speed. The only variability is how that total light speed is allocated between space and time respectively.
For example, this is why if you go faster through space you experience time more slowly compared to a reference point travelling through space more slowly because in order to both be travelling through spacetime at the same speed the other reference point going more slowly through space must be going more quickly through time.
So essentially, it seems that everything moves at the same speed because there is only one speed and that is light speed . It’s more of a quirk of our abilities to perceive reality that creates an illusion that time and space are independent constructs.
The reason that it appears you can’t go faster than light specifically through space is because in order to do that you have to experience zero time. Essentially you have no more velocity available through time to reassign towards velocity through space since the sum total cannot exceed light speed through spacetime.
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