On second thoughts, I find this graphic also misleading because it suggests that the proper observable universe (diameter 93BLys) is not actually homogenous and isotropic in all locations, which is important.
If instead it represents the supercluster light which we currently receive here on...
This is an example of one such graphic, showing local superclusters, which I believe shows the relative positions of superclusters as viewed from Earth today. I do not know how accurate this is supposed to be. If it was updated to show proper distances, then I assume that the effects of...
mfb, thanks for the link that the ELT is using direct frequency measuring variation of the expansion rate of the Universe over time. Very interesting.
I wish the same could also be done with the CMBR, but it appears to diffuse and without any sharp lines. Up around 500GHz and around 3GHz the...
Peter, in this case wiki is saying:
"The Universe's expansion causes all galaxies beyond the former Milky Way's Local Group to disappear beyond the cosmic light horizon, removing them from the observable universe".
However according to George, this is incorrect because all the galaxies which can...
Thanks all for clarifying the 2.53c misprint. 6c was correct.
Peter, thanks for replies, so this is another wiki inaccuracy it seems.
I have been looking at Lineweaver 2003.
https://arxiv.org/pdf/astro-ph/0310808.pdf
I have also used this one at various times...
Reading through the replies I see there is a disagreement on the recession velocity Vp of CEERS-93316 (redshift 16.7) when the light we see on Earth was first emitted. We have 6c and 2.53c.
2.53c is the same recession velocity as today.
The recession velocity for the matter which created the...
Wikipedia also has a page regarding the far distant future of the Universe.
They mention what they think will be observable at 100 Billion years in the future:
https://en.wikipedia.org/wiki/Timeline_of_the_far_future
Ethan here says that 100B years from now even the closest galaxy will be...
I thought I read various articles which state that only our local group of galaxies remain in our observable universe many 100s Billions of years in the future?
These are the numbers I passed on:
At t = 379,500 years after the BB, the CMB photons we receive today were located at a distance of 0.04144 Gly from our location with redshift 1092. The matter which emitted those photons had a recession speed of 66.416c at that time. Now, today, that matter is...
Thanks Bander,
So, the light from CEERS-93316 (redshift 16.7) was emitted 235.8 million years after the BB, when it was 2GLYRS from us and its recession velocity at that time was 6c.
Its current distance is 34.7GLYRS and its current recession velocity Vp is 2.53c.
I agree measuring the CMBR...
Thanks all. My main, remaining unanswered questions are:
1. Interesting that it would be 1.45 Myr for the wavelengths of the CMB to increase by a factor of 1.0001. The accuracy of an atomic clock error is 1 in 10^14, so we should be able to see a change in the frequency of the CMBR redshift in...
Thanks Jim, this is another link to Ethan's article:
https://www.patreon.com/posts/ask-ethan-will-40189763
Interesting that it would be 1.45 Myr for the wavelengths of the CMB to increase by a factor of 1.0001
The accuracy of an atomic clock error is 1 in 10^14, so we should be able to see a...
Thanks for very thoughtful, helpful replies. I had struggled for a week or so.
Yes, I was interested in proper distance.
I am interested in the observable universe in which if light was emitted today that it would still be possible to reach us here eventually. To confirm, this is the event...