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I think the "tired light" hypothesis has more to do with a change in wavelength rather than a change in the actual speed of light.
This is an entirely new proposal - that light slows down over time. If it seems to immediately resolve some of our current issues to do with inflation and dark energy, and physicists are taking it seriously enough to test it out in space, it might have some credence!
Interesting to see what the results will show.
Regards, Rob
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