eli5 how do we know nothing is faster than light?

Question

eli5 how do we know nothing is faster than light?

In: 452

Answer 1

While others have given you exhaustive answers, there’s still a caveat. [We actually can’t measure one-way speed of light](https://en.wikipedia.org/wiki/One-way_speed_of_light?wprov=sfti1). While you would never move faster than light in the same direction, you might be faster than light moving in another direction in respect to your movement.