Oh yes! We know that light has a speed of 299 792 458 m/s but do we know that darkness does too? If so, then how is it possible? What is the highest speed of darkness?
We know that darkness is the absence of light, and that light travels at the fastest speed possible for a physical object! So what does this suggest? It suggests that, the moment that light leaves, darkness returns. Darkness travels at the speed of light. More accurately, darkness does not exist by itself as a unique physical entity, but is simply the absence of light. Any time you block out most of the light – for instance, by cupping your hands together – you get darkness. In the context of talking about speeds, darkness is what you get after the light stops coming, and therefore travels at the speed of light.
You can think of darkness as what you get right after the last bit of light arrives. Since the last bit of light travels at the speed of light, the state right after must also travel at the speed of light.
If the sun suddenly disappeared, it would stop shining light on the earth and the earth would go dark. But it takes 8 minutes and 19 seconds for the light from the sun to reach earth. The last bit of light given off by the sun right before it disappeared would take 8 minutes and 19 seconds to reach us, and the darkness that comes right after the last bit of light would also take 8 minutes and 19 seconds to reach us. We on earth would not see the sun disappear from the sky until 8 minutes and 19 seconds after it had vanished.
However, in some instances, darkness actually moves faster than light. But does this mean that information can travel faster than light?
Check out this mind-blowing video that explains the speed of dark, stages of twilight, shadows, the rate of collecting knowledge versus realizing the depths of our ignorance , and more:
Video by Vsauce. Stay tuned for more!