The first nuclear clock will test if fundamental constants change
https://www.quantamagazine.org/the-first-nuclear-clock-will-test-if-fundamental-constants-change-20240904/loading story #41451189
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They probably do change, but extremely slowly. It would feel strange if there were something fixed in the universe.
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this is a bit tangential, but I once had a physics professor describe light waves as standing still and everything else is just moving around it.
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well no, photons move at the speed limit of causality in this universe
they actually arrive slightly later than neutrinos to observers on earth because neutrinos just plow through virtually anything including stars and planets while photons have to travel the path affected by gravity
photons aren't affected by gravity directly because massless but their path, their limit of causality, is affected
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