
#1
Sep404, 01:50 AM

P: 54

My question is what is the speed of dark?
Does space the black of space have a speed? Many Thanks Blair Styles 



#2
Sep404, 01:58 AM

P: 1,113

darkness is the absense of light
so in that aspect it always everywhere, but can't be added or removed faster than c. 



#4
Sep404, 02:08 AM

P: 1,113

What is the speed of dark? (space)what i was saying given the speed of c in the environment darkness is limited by it. 



#5
Sep404, 02:09 AM

P: 1,113

or you could say that darkness is instantious and that light is just in the way of it but it is there its just that photons are blocking it and that when they are gone it is instnatly there.




#6
Sep504, 07:54 AM

P: 15

Darkness is the abscence of light, therefore the speed of darkness is the speed it arrives, therefore the same as the speed of the departure of light. The speed of darkness = the speed of light




#7
Sep504, 08:07 AM

P: 603





#8
Sep504, 08:08 AM

Sci Advisor
PF Gold
P: 2,226

It depnds what you mean by the 'speed of dark as it could be interpreted in sevral ways. For example there is no limit on the coordinate velocity of a shadow.




#9
Sep504, 10:50 AM

P: 207

The speed of darkness is 0. It does not move, travel, or propigate in any way. It may appear that way, and the comments saying it is relative to the speed of light seem consistant with our observations. One might ask what is the speed of no electricity in a conductor. 



#10
Sep504, 11:16 AM

P: 1,113

when I said c changes it was assumed i meant in accordance with differnt mediums




#11
Sep504, 02:22 PM

P: 603

It's really just a matter of notation but c is the value of the speed of light in vacuum. So it's better to say, the speed of light (not c) is different for different media.
About the speed of light in a vacuum; it is exactly 299792458 m/s because it is the definition of the meter. A meter is the distance light travels in a vacuum in 1/299792458 second. So If the speed of light in vacuum turns out to be a little different than previously measured this changes the distance of one meter and not the constant c! 



#12
Sep504, 07:49 PM

P: 54

My question is if this is true then what about a black hole's does it move in space if the answer is yes then i must ask again. What is the speed of dark? 



#13
Sep604, 01:02 AM

Emeritus
Sci Advisor
PF Gold
P: 10,424

"Dark" is not a welldefined physical concept, so this thread cannot possibly be anything but philosophical. I am thus moving it.
 Warren 



#14
Sep604, 03:04 AM

P: 54

Many Thanks Blair Styles 11:11 



#15
Sep604, 03:14 AM

P: 1,967

Darkness is a well defined physical concept it is the absense of light, duh! However, the vacuum flux guarantees their will always be some small amount of light as long as there is spacetime. Hence, what we call darkness is relative and obeys the Uncertainty Principle. This means, of course, that it's speed can be greater than that of light, especially since it carries no energy or information.




#16
Sep604, 03:27 AM

P: 54

What about planet earth and the sun they full of information and can also generate energy that energy can be used as power or am i way off? http://www.planetware.de/octave/sun.html If the sun makes a sound then that energy must move in space or does space move the energy? 


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