This isn't even remotely the only way to measure distance.

…, which scientists understandably equated with the well-established phenomena of the Doppler effect. They assumed, therefore, that a galaxy showing a redshifted spectra is traveling away from us, the greater the redshift, the greater the speed. (They also assumed that greater redshift means greater distance, a circular reasoning that we will set aside for now.) That so many galaxies appear to be redshifted, meant, the scientists assumed, that the whole univer…
What if the Universe Is NOT Expanding?
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Douglas Giles, PhD
Rex Kerr
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Feb 27, 2023
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This isn't even remotely the only way to measure distance. It was never really circular reasoning (though people were happy to be able use redshift once it checked out at closer distances, because it's one of the easiest things to measure). For an overview, see https://en.wikipedia.org/wiki/Cosmic_distance_ladder
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Written by Rex Kerr604 Followers
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One who rejoices when everything is made as simple as possible, but no simpler. Sayer of things that may be wrong, but not so bad that they're not even wrong.
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