speed of light

“Why is there a speed limit?” can mean two slightly different things: Why is there any maximum speed at all—why isn’t information allowed to propagate arbitrarily fast? Why is the limit the particular value we call c—about 3 x 108 … Read More

But we should also know why we ourselves, in our turn, measuring the speed of light by terrestrial experiments such as those of Fizeau or Foucault, we always find the same number c, whatever the speed of the Earth relative … Read More