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No, new measurements can't relax the Hubble tension - There are two different ways to measure the expansion rate of the Universe, and they don’t agree. And no, new measurements don’t help. (bigthink.com)

submitted 2 weeks ago by [email protected] to c/[email protected]

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[–] FooBarrington 5 points 2 weeks ago (1 children)

When space expands, everything inside is stretched, including light. When light is stretched, its wavelength decreases (= redshift). So you just measure how much lower the light frequency is than you'd expect :)

[–] [email protected] 1 points 2 weeks ago

the wavelength increase. The frequency decrease. Red as a wavelength of 700nm while blue is about 500nm.