| http://www.w3.org/ns/prov#value | - Hence different materials such as water, crystals ,glass exhibit different index of refraction so light travels at different speeds in these materials=Hence its not constant.If space would have different densities and different Field pressures, than it would make sense to say that the speed of light is variable in the Universes since it would travel in different densities of space -time.You last p
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