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Information Junky
Join Date: Mar 2001
Location: an island, upper left coast, USA
Posts: 73,167
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If a camera flashes in a dark room, the begining of the flash (of light) will travel at the same speed as the last bit of of light in the flash.
SO, since the absence of light is "dark". . . it follows that light and dark will travel at the same speed.
V(dark)=C
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Everyone you meet knows something you don't. - - - and a whole bunch of crap that is wrong.
Disclaimer: the above was 2¢ worth.
More information is available as my professional opinion, which is provided for an exorbitant fee. 
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