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Ian,
A little more prosaic than G'day's.
Q: The speed of light is generally accepted to be constant, at least through a vacuum. We are also told that the speed of light varies should the light pass through a different medium.
In view of the fact that it is believed that space is not really empty is it possible that the red and blue shifts recorded by astronomical instruments are in some way being corrupted by our reliance on the 'given' speed whilst ignoring possible intervening events between distant sources and our sensors?
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