said by JPL:said by Skippy25:The speed of light as we know it is light in a vacuum. Fiber does not run at that speed and can't because it is 1.) Not in a vacuum and 2.) Running across a cable that introduces some resistance.
Vacuum? Per Einstein, that's utterly irrelevent. The speed of light is fixed. Period.
the famous speed of light number is actually when in a vacuum. when light travels through transparent objects, it will slow down. Just like when light travels through water it will slow down.. then when it's out of water it will speed back up again. Know your physics before posting.