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Renneder@sh.itjust.works

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 3 months ago by Renneder@sh.itjust.works to c/becomeme@sh.itjust.works

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[–] FooBarrington@lemmy.world 5 points 3 months 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 :)

[–] Beartotem@sh.itjust.works 1 points 3 months ago

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