Darkness is indeed the absense of reflection of light 由 definition, it's not so much what we know, but if dark is to be defined, then light has to be defined. Darkness is an adjective, and one might ask if 你 are talking about complete darkness. I would say the speed of darkness as I understand it would be the speed it arrives. The reason it is 说 that the absense of light is because light is a thing called eloctromagnetic waves.
I could go through a physics lesson 或者 something right now, but I'll just this: DARK DOESN'T MOVE. I'm also 90% sure that it's not even a noun. ._. 随意 song~
Surely the speed of 'dark', which doesn't actually exist as others have already pointed out it is the absence of light, should be the speed a which it takes for the light to vacate the area that is 'dark'?
Or, if it is already 'dark', then there is no speed, unless 你 count the speed at which our eyes recognise that there is no light.
