Staying Safe In Manchester.....
ChatterBank2 mins ago
No best answer has yet been selected by johnlambert. Once a best answer has been selected, it will be shown here.
For more on marking an answer as the "Best Answer", please visit our FAQ."Lght"is just a small part of the electromagnetic spectrum. "Darkness" is simply the condition under which those parts of the spectrum visible to humans are not available to us to view. Radiation is still all around us, still travelling "at the speed of light." So, the answer to your question is:
298,000 miles per second.
Give or take a few seconds.