The speed of 'dark' is the same as the speed of light. As soon as light diminishes, darkness appears. As fast as light travels on, darkness is left behind.
Light travels at a constant, finite speed of 186,000 miles a second, as does 'darkness'.

I think Rod was being facetious when he asks, "OK, ... so what's the speed of dark?"

There is no such thing as the speed of dark, since it's not well defined. As for your definition of speed of light, it's approximately 186,000 m/s. The exact value is available in Wikipedia as it defines what a meter is.

If you had to speak of "speed of dark", I suppose one could conceive of speed of a black hole which is the absence light, since its gravity is so high that even light cannot escape from it. Thus for something to be ejected from a black hole, its escape velocity would have to exceed the speed of light.

I regarded Rod's question as a kind of Zen question like what is the sound of one hand clapping.
It is simply what it is.

It is simply what it is under different circumstances.Darkness in most peoples eyes and minds is a scarey thing.
Without darkness there is no light and without light there can be no darkness.
The black hole circumstance is an intriguing one Partha.How fast can darkness push, pull, direct, and bend light?
On the other hand, How fast can light push, pull, direct, and bend darkness?
Considering the black hole hypothesis, does this mean darkness can manipulate light but light cannot manipulate darkness?
No because light can manipulate darkness simply by illuminating itself in the presence of darkness.
Some darkness sticks around and we call those shadows.

I asked this question because there is simply no answer.
Something to think about though.

Possibly when we learn more about black holes we can learn to understand darkness or the eluding dark matter.Everything space is that we cannot see.

Here are some more questions.
Where does light go when you turn out the light?Where does dark go when you turn the light back on?
Is it simply that we stop seeing color?Or is there something more?

@ Rod,

Seems like this could go on for ever, without any real clear and definitive resolution to any of these questions.

Were you being clever when you asked this question, or are you being clever in your reply to those who attempt to answer this question?

@K1TesseraEna

Light is composed of photons, does a photon have mass? The answer is definitely no. The photon is a massless particle. According to theory, it has energy and momentum but no mass.

Even before it was known that light is composed of photons, it was known that light carries momentum and will exert pressure on a surface. This is not evidence that it has mass since momentum can exist without mass.

If something has momentum, then it must have a measurable speed. Both light and darkness can be said to possess this quality. Therefor they both have a speed.

This is what I think of all of you:

Does darkness have the properties of a particle or a ray?

I don't believe this to be a philosophical question but a rather clear one, scientifically. Why it seems unclear is because we live our daily lives deeply embedded in a thick atmosphere that scatters visible light all around us - making it feel like light and darkness are on more even footing than they really are. Our daily experience confuse us.

The answer is that darkness does not have a speed. It has no self-motion. It's not equivalent to a fluid that fills into the gap left behind by light. Rather, light is travelling through darkness - darkness is equivalent to vacuum, the absense of energy.

Thought about in another way, speed is the length of a vector of motion. Which direction is darkness pointing, and why would it have a speed? Byt the same notion darkness do not deliver momentum (unless you go into exotic theories such as vacuum fluctuations and things like that).
.
Griatch (who tends to see things from an astronomical perspective being an astronomer)

I'm with you Griatch, I might add luminance is really the only difference.

@ Wallace - This conversation is why i posted the question in my signature.It's really an amazing question.
@ Griatch - Perhaps darkness is always present until light bends it to occupying it's own space within darkness.

Perhaps darkness doesn't need to have motion because it's already there.
Perhaps light really doesn't have speed either and it's everywhere already.We just need to pass certain energies through darkness to change it's behavior to become light?

But then this raises the question, is light itself really just illuminated darkness?
Can i go into a lit room and create a beam of darkness with a flashdark?

What Is The Speed of Dark?

https://www.youtube.com/watch?v=JTvcpdfGUtQ

"Who knows what evil lurks in the hearts of men? The Shadow knows!"

That video was good.

Yes, that shadow is somthing.