Quote:
Originally Posted by sillysally  So there exists a speed of light but how come I never heard of the speed of dark?
Isn't dark faster than light since it came first? Or did it? Which came first light or dark? |
Sal .... You could be on to something ... LOL
When we observe the light spectrum of a distant galaxy or cluster the colour ranges from Red, Yellow, Green, Blue. Purple, Indigo, Violet (I think)
Across this rainbow spectrum, dark lines are visible. These, shaped like a barcode, are actually the absence of light, the absorption lines. The distant object, emitting light across the whole spectrum did not emit any light in these absorption areas.
The absorption lines tell us a huge amount about the object emitting the visible light. This absence of light is instantly available, as you say, because nothing has to cross between the object and us. Zero time.
Infortunately they are not visible, tho still there, until the emitted light reaches us at the speed of 'c', and so enables us to contrast the absorption lines on the rainbow background.
Sal ... I hope this makes sense ... LOL
cool bananas ... greg
