Timeline for If we watched extremely red-shifted galaxies near the edge of the observable universe for a very long time, how would they change? Would more appear?
Current License: CC BY-SA 4.0
12 events
| when toggle format | what | by | license | comment | |
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| Jul 9, 2021 at 0:04 | vote | accept | uhoh | ||
| Jul 7, 2021 at 13:55 | comment | added | pela | Just one more edit, and I'll leave this be :) A "galaxy" entering our horizon today will decrease from $z=\infty$, to $z\sim60$, to $z=\infty$. | |
| Jul 6, 2021 at 21:00 | history | tweeted | twitter.com/StackAstronomy/status/1412516717616635906 | ||
| Jul 6, 2021 at 13:56 | comment | added | pela | I made my own spacetime diagram, omitting some information that wasn't necessary. | |
| Jul 5, 2021 at 11:14 | comment | added | uhoh | @pela I'm enjoying it now, thank you! | |
| Jul 5, 2021 at 11:13 | comment | added | pela | Okay, I tried to have a go at it. | |
| Jul 5, 2021 at 11:13 | answer | added | pela | timeline score: 8 | |
| Jul 4, 2021 at 12:47 | comment | added | uhoh | @pela I checked briefly and I can see I will need to look at them again in the morning here, and I'm not confident I'll be able to understand them sufficiently to know the answer to my question here with any confidence. If those answers tell us just how the current horizon galaxies' appearance will be different in 100 million years, if their red shift z will go up or down and if we'll see more, and that can be summarized briefly here, that would be an ideal answer; a few sentences linking to those answers as authoritative sources. | |
| Jul 4, 2021 at 11:18 | comment | added | pela | Your question about observing at a given redshift is also answered there: If you follow the dashed lines (e.g. the one called "z = 50") in answer #2's spacetime diagram, you'll see that in the beginning more and more distant galaxies will have that redshift, but at some point in the future, galaxies with that redshift will be progressively nearby. | |
| Jul 4, 2021 at 11:16 | comment | added | pela | The redshift of galaxies entering the horizon decreases from infinity to a minimum value, after which is increase to infinity again. I started writing an answer, but then I found this one and this one on physics.SE, which I think answer your question. | |
| Jul 3, 2021 at 0:37 | history | edited | uhoh | CC BY-SA 4.0 |
added 316 characters in body
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| Jul 3, 2021 at 0:30 | history | asked | uhoh | CC BY-SA 4.0 |