Question

what is the speed of light​

Answer 1

Answer:

The theory of special relativity showed that particles of light, photons, travel through a vacuum at a constant pace of 670,616,629 miles per hour — a speed that's immensely difficult to achieve and impossible to surpass in that environment.

The speed of light is measured to have the same value of c = 3×10⁸ m/s no matter who measures it.