BecomeMe

805 readers

1 users here now

Social Experiment. Become Me. What I see, you see.

founded 1 year ago

MODERATORS

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

10 comments fedilink hide all child comments

you are viewing a single comment's thread
view the rest of the comments

[–] KISSmyOSFeddit@lemmy.world 2 points 5 months ago (3 children)

Not directly related, but if you convert the units, 73 km/s/Mpc are 11.16 meters per year per AU (the distance between earth and the sun)

Somehow it blows my mind that the distance between the sun and earth increases by 11m per year due to the expansion of space itself.
But I still don't really understand how we can measure that expansion.
If space expands, wouldn't everything we can use as measuring stick expand as well?

[–] FooBarrington@lemmy.world 5 points 5 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 5 months ago

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

load more comments (1 replies)