This topic came up in the ATM forum as well: New Evidence for Tired Light. I review the paper in that thread (post #5). I think that the New Scientist article, and the blog piece posted in ATM both seriously exaggerate the significance of the observations.

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The point of philosophy is to start with something so simple as not to seem worth stating, and to end with something so paradoxical that no one will believe it. -- Bertrand Russell