How fast is the speed of dark?

Mybe it would help to explain it with bigger scales of distance;

if you look up at the sun, the light you see actually left the sun 8 minutes ago. If the sun were to vanish suddenly (ie stop emitting light) it would take 8 minutes before we knew about it here on earth.
 
Light follows a straight line, but the space that the light is travelling through may be curved or bent by a gravitational field.
 
So if dark either has a speed of 0 m/s or dark is the absence of all things, which I believe are the main two serious answers coming from people. Then what in hell is dark matter? No speed = no mass, not there = no mass. So physicists have made up all this balls about dark matter for fun?
 
branddaly said:
So if dark either has a speed of 0 m/s or dark is the absence of all things, which I believe are the main two serious answers coming from people. Then what in hell is dark matter? No speed = no mass, not there = no mass. So physicists have made up all this balls about dark matter for fun?
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For a start, you can't quantify darkness as it is just the absence of light and is a non quantity; it doesn't have any speed at all, and doesn't make sense to try and give it a speed. It would be like trying to give a speed to the absence of a car.

Dark matter is something completely different and unrelated - it's matter that does not emit or reflect EM radiation, and as such cannot be detected directly. Its existence hasn't actually been proven yet and is just a theory.

And where did you get no speed = no mass from? :confused: I'm currently stationary (relative to the Earth at least) and I still have a mass.
 
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Spleenus said:
Because light travels in packets of energy called photons and although these particles are massless they are still particles and are affected by gravitational fields.
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Erm, just because something sometimes behaves like a particle, does not in itself imply that it is affected by gravity.

You need to check gen rel to know why everything is affected by gravity.
 
Inquisitor said:
For a start, you can't quantify darkness as it is just the absence of light and is a non quantity; it doesn't have any speed at all, and doesn't make sense to try and give it a speed. It would be like trying to give a speed to the absence of a car.

Dark matter is something completely different and unrelated - it's matter that does not emit or reflect EM radiation, and as such cannot be detected directly. Its existence hasn't actually been proven yet and is just a theory.

And where did you get no speed = no mass from? :confused: I'm currently stationary (relative to the Earth at least) and I still have a mass.
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My god! Some one actually bothered to answer seriously. :eek:
 
branddaly said:
My god! Some one actually bothered to answer seriously. :eek:
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hey some of this stuff this stuff is quite interesting for for those who enjoy the physics aspects of it (or is that just me?)
 
I figure that the only way to test this is empirically. I got a torch, and measured how long it took from the time I turned it on until the light hit the opposite wall of my room.

My room is about 15 feet wide, and it took about 0.0000000153 seconds for the beam of light to cross my room. Therefore I conclude that the speed of light is about 300,000,000 m/s.

When I turned my torch off, it took exactly the same amount of time - 0.0000000153 seconds - for the light to disappear from the opposite wall. I therefore conclude that the speed of dark is the same as the speed of light, i.e. about 300,000,000 m/s.

This was done using Science, and therefore you can't argue with it.
 
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