How fast is the speed of dark?

[Ricochet J]

The speed of light in a vacuum is exactly 299,792,458 metres per second (or 1,079,252,848.8 kilometres per hour, which is approximately 186,282.397 miles per second, or 670,616,629.4 miles per hour).

Think about it, when you switch the light on, you get light speed. When you see lightning you see a flash. When you watch a movie you view pictures. All from light, which is fast light.

But then, when you switch the light off, you get dark speed? When the lightning dissappears, you get darkness. When you switch the television off, you see no pictures.
So then, at what speed is Dark Speed?
I might even be way off, WHAT is the speed of dark?

Is it just simply -299,792,458m/s? How would you measure the speed of dark when the Universe is dark?

Any ideas?

 

[benjo]

Speed of dark wouldnt exsist? Theres nothing there to measure the speed of...

 

[theo]

'dark' is the absence of light, therefore it has no speed, but the velocity at which it appears or dissappears would be the same as the velocity of light in that medium

dark isn't a measureable source

 

[Zip]

Dark doesnt move.
Its stationary.

In a simple term its like this.

Light is a car.
Dark is the road.

 

[cleanbluesky]

Given that darkness is the absence of light, it is immeterial and therefore cannot have a speed

 

[McDaniel]

lol

 

[Mr Spew]

It'd be the same speed as light retracting, since when the light turns off, it takes that amount of time to disappear - you can't turn dark on, it's nothing, it doesn't travel since it isn't anything.

 

[Oliver]

Wouldn't it go as quickly as it comes?

 

[agw_01]

If light speed is 299,792,458m/s, dark speed is 0m/s.

Dark stays still, light comes and goes

(As has already been said )

 

[laiman]

slightly off topic how do projectors project black onto a white screen or is that why you need a dark room to get the best effects?

 

[Fusion]

This reminds me- where's my black torch got to.

 

[Mr Spew]

slightly off topic how do projectors project black onto a white screen or is that why you need a dark room to get the best effects?

Black on a screen = every other colour combined to make something like black.

 

[Nix]

The speed of dark?

Darkness is just lack of light. So therefore it will be the same speed as light. As it light disappearing.

 

[laiman]

ok cool, but not actually black, I sense a challange here? lol

 

[Amp34]

slightly off topic how do projectors project black onto a white screen or is that why you need a dark room to get the best effects?

Thats what both me and my dad want to know.

 

[PhilthyPhil]

Black on a screen = every other colour combined to make something like black.

If you combine all colours you get white

 

[Ricochet J]

But hang on, how do you know dark is the absense of light and not the other way round.
As an analogy, is a Zebra white with black stripes or black with white stripes?

Taking the above into consideration then how was light measured, and surely the same can be done to dark. One does not know the boundries of the Universe to make the statement dark is the absense of light!

 

[Nix]

But hang on, how do you know dark is the absense of light and not the other way round.
As an analogy, is a Zebra white with black stripes or black with white stripes?

Taking the above into consideration then how was light measured, and surely the same can be done to dark. One does not know the boundries of the Universe to make the statement dark is the absense of light!

What do you get in space when there is no stars to admit light and heat?

Total darkness.

 

[Chronos-X]

Can anyone explain what light actually is, and why it can/can't be contained?

 

[Sparky__H]

Because space, being the absence of all mater and light, is black.