Is the observed delaying of photons emitted by SNIa best evidence that space is expanding or should this be explained otherwise and how?
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Related, if not dupe of, https://physics.stackexchange.com/q/154507/25301, https://physics.stackexchange.com/q/186405/25301, https://physics.stackexchange.com/q/113939/25301, https://physics.stackexchange.com/q/223610/25301, etc – Kyle Kanos Mar 30 '19 at 01:07
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It's not evidence "for" an expanding universe; it is evidence against tired light scenarios. – ProfRob Mar 30 '19 at 08:33
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It's closest to https://physics.stackexchange.com/questions/156618/tired-light-red-shift-hypothesis but not a duplicate. This asks for alternate explanations; but AFAIK there is no plausible alternate that also explains the CMB, primordial abundances etc. – ProfRob Mar 30 '19 at 08:41