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Hi,
Correct me if i am wrong, but in high school I learnt that the speed of light is a constant for all observers in a particular medium. For example the speed of light in a vacum is higher than the speed of light in water which is higher than the speed of light in glass. The speed difference is responsible for the refraction effect and for rainbows.
This is a simple fact, no need to bring in Bose Einstein condensates or imply that interstellar objects are nearer or further away because of the proven fact that C is different in normal everyday mediums.
Cheers
Paul
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