from Hacker News

Ring of galaxies challenges thinking on cosmos

by chkhd on 1/12/24, 3:31 AM with 12 comments

• by neom on 1/12/24, 4:26 AM

  For those interested in learning more about the Cosmological Principle

  PSB Spacetime- Where Is The Center of The Universe?

  https://www.youtube.com/watch?v=BOLHtIWLkHg

  Giant Arc 3.3 Billion Light Years Long That Shouldn't Really Exist:

  https://www.youtube.com/watch?v=Wj1ULGmPe6s

  The Case Against the Cosmological Principle (and/or FLRW) - Jenny Wagner:

  https://www.youtube.com/watch?v=nASUsWQyemc

  SciShow- What If the Universe Isn't Uniform?

  https://www.youtube.com/watch?v=YGVW4BaA0qA

• by yzydserd on 1/12/24, 6:16 AM

  The bbc has a better article in their science section at https://www.bbc.co.uk/future/article/20230302-the-giant-arcs... dated March 2023. Today’s article is triggered by a presentation of results but contains less information.

• by sema4hacker on 1/12/24, 5:30 AM

  I don't understand. Since the entire universe might be huge compared to the observable universe, is this structure really that unlikely?

• by jl6 on 1/12/24, 7:47 AM

  How do we measure the distance to those galaxies to be sure that it’s really a ring, rather than something that looks like a ring from our perspective? I know that supernovas provide one technique for distance measurement, but it feels unlikely that we’ve done that for every galaxy in this structure?

• by defrost on 1/12/24, 4:38 AM

  And Is the Observable Universe Consistent with the Cosmological Principle?

  - Classical and Quantum Gravity 40(9) (April 2023)

  https://iopscience.iop.org/article/10.1088/1361-6382/acbefc

• by slowmovintarget on 1/12/24, 9:46 PM

  The Xeelee have begun construction of the Ring.