mfb- t1_iyy7hip wrote
Reply to comment by quetric in How are we sure that speed of light and other basic constants are really constants on a large cosmological scale of time and space? by The_Dark_Passenger93
Tests of the fine structure constant compare different wavelengths from the same source. The ratio depends on the fine structure (for suitable transition choices) while redshift cancels in the ratio. The uncertainty on the redshift is far too large for the extremely precise measurements (~10^(-7) level) we can do with the ratios (/u/forte2718 ).
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