Timeline for Oldest in the universe
Current License: CC BY-SA 3.0
8 events
| when toggle format | what | by | license | comment | |
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| Jul 2, 2016 at 17:29 | comment | added | adrianmcmenamin | @called2voyage The first question is "how do we determine which part of the universe is the oldest?" The answer above also refers to the "oldest objects" - aren't hydgrogen atoms formed in the recombination epoch objects? Also the only thing we "see" are photons so your basic point is not even physical. | |
| Jun 29, 2016 at 16:45 | comment | added | called2voyage♦ | @adrianmcmenamin Photons are not galaxies. The question asks for the oldest galaxies, not the oldest objects. | |
| Dec 12, 2015 at 18:29 | comment | added | adrianmcmenamin | Yes and no. What we actually see are the photons and in the case of the CMB these photons are the oldest things we can 'see'. But yours is an interesting argument, for sure. | |
| Dec 9, 2015 at 12:49 | comment | added | Nico | Oh, I get it now. Thanks for clarifiying. | |
| Dec 9, 2015 at 12:12 | history | edited | ProfRob | CC BY-SA 3.0 |
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| Dec 9, 2015 at 12:08 | comment | added | ProfRob | @Nico Our galaxy is 12 billion years old (roughly). If I look at a galaxy that is 5 billion light years away, the maximum age of that galaxy is 13.7-5 = 8.7 billion years old. i.e. Younger than our galaxy. | |
| Dec 9, 2015 at 10:37 | comment | added | Nico | I think you are wrong when you say "Therefore, by and large, these galaxies are younger than ours.". This is not what looking at distant galaxies means. It means the galaxy you are looking at is AT LEAST as old as the time it took for it's light to reach you. Did I miss your point or are you indeed wrong ? Please correct me if I'm wrong. | |
| Dec 8, 2015 at 23:50 | history | answered | ProfRob | CC BY-SA 3.0 |