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[QUOTE]Originally posted by Colorful Cartman: [QB] What you're thinking of is the refractive index of various transparent media (glass, water, etc). Relativity concerns the speed of light in vacuum, which is an absolute limit. Gravity has no influence on the [i]rate[/i] of propagation, it only affects the [i]direction[/i] light travels in. Light can be slowed artificially by something called a Bose-Einstein condensate -- basically a bunch of particles cooled to a temperature near absolute zero, causing them to spread out and overlap (one of those weird quantum effects governed by Heisenberg's uncertainty principle). [/QB][/QUOTE]
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