Sujet : Re: Is the universe infinite, or does it have a limit?
De : '''newspam''' (at) *nospam* nonad.co.uk (Martin Brown)
Groupes : sci.astro sci.electronics.designDate : 05. Feb 2026, 16:14:51
Autres entêtes
Organisation : A noiseless patient Spider
Message-ID : <10m2c5c$39e8e$1@dont-email.me>
References : 1 2 3
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On 05/02/2026 06:23, Jan Panteltje wrote:
Thomas 'PointedEars' Lahn <PointedEars@web.de>wrote:
However, our universe is expanding, and there are points whose distance from
each other increases faster than light could propagate between them. So
even if our universe would be closed, it would not be possible for light to
arrive at its point of emission by going around our universe. Maybe that is
the reason why this has never been observed.
Just a simple question, I am no astrofishycist,
is that 'expansion' we observe deduced from the red shifts we measure?
Or brightness of some stars?
Actually both. Redshifts give the most reliable data at cosmological distances and you can see all the clouds of neutral hydrogen along the like of sight if you find a suitably bright remote quasar. The so-called Lyman forest of absorption lines.
https://en.wikipedia.org/wiki/Lyman-alpha_forestIn addition there are also certain stars like a particular class of supernova type IA that due to how they arise go bang at more or less exactly the same total mass every time and so from the lightcurve and it's peak brightness you can work out how far away it is. The brightest of the standard candles these supernovae can outshine their entire host galaxy for a couple of weeks. Catching them early helps astrophysicists pin them down and amateur supernova surveys with CCD cameras assist.
https://science.nasa.gov/mission/roman-space-telescope/type-ia-supernovae/New professional hardware is coming online to speed discovery up.
There is no way for us to know if the universe itself is infinite or just very very big. There is always going to be a finite limit to the region that we can ever know about (ignoring for the moment that at the greatest distances it is an optically opaque hot plasma now seen as the 4K microwave background radiation.
How about tired light theory (light slowing down causing redshift)?
Doesn't really hack it at all. Pauli's phrase "Not even wrong" is probably the kindest description for Le Sage Theory.
https://en.wikipedia.org/wiki/Not_even_wrongPersonally I am with Le Sage theory, for me it explains much, like clocks
slowing down near a heavy object.
I also think 'science' should stop babbling about infinities,
mamaticians doing a divide by zero all the time
Singularities
There are no 'infinities' in nature!
Something will always break down, give way!
Curiously you may well be right about that - some apparent infinities in physical theories can be effectively magicked away by the right use of mathematics (aka renormalisation theory). QCD depends on it.
And Le Sage does explain some internal heating of stellar objects, say Pluto for example.
https://en.wikipedia.org/wiki/Le_Sage%27s_theory_of_gravitation
In short, we need a MECHANISM to explain things, like we need ELECTRONS in electronics
Not math and Spices
Mathematics *is the tool* for explaining physics - hand waving woolly word salad has no predictive power and is fundamentally untestable.
-- Martin Brown
| Date | Sujet | # | | Auteur |
| 5 Feb 26 |  Re: Is the universe infinite, or does it have a limit? | 40 | | Jan Panteltje |
| 5 Feb 26 |  Re: Is the universe infinite, or does it have a limit? | 4 | | Bill Sloman |
| 6 Feb 26 |   Re: Is the universe infinite, or does it have a limit? | 3 | | Bill Sloman |
| 6 Feb 26 |  Re: Is the universe infinite, or does it have a limit? | 2 | | Jan Panteltje |
| 6 Feb 26 |  Re: Is the universe infinite, or does it have a limit? | 1 | | Bill Sloman |
| 5 Feb 26 | Re: Is the universe infinite, or does it have a limit? | 4 | | Martin Brown |
| 5 Feb 26 | Re: Is the universe infinite, or does it have a limit? | 3 | | Jan Panteltje |
| 6 Feb 26 | Re: Is the universe infinite, or does it have a limit? | 2 | | Martin Brown |
| 7 Feb 26 | Re: Is the universe infinite, or does it have a limit? | 1 | | Jan Panteltje |
| 5 Feb 26 | Re: Is the universe infinite, or does it have a limit? | 31 | | Nioclás Pól Caileán de Ghloucester |
| 5 Feb 26 | Re: Is the universe infinite, or does it have a limit? | 2 | | john larkin |
| 5 Feb 26 | Re: Is the universe infinite, or does it have a limit? | 1 | | Nioclás Pól Caileán de Ghloucester |
| 6 Feb 26 | Re: Is the universe infinite, or does it have a limit? | 28 | | Jan Panteltje |
| 6 Feb 26 | Re: Is the universe infinite, or does it have a limit? | 8 | | Bill Sloman |
| 6 Feb 26 | Re: Is the universe infinite, or does it have a limit? | 7 | | Jan Panteltje |
| 6 Feb 26 | Re: Is the universe infinite, or does it have a limit? | 6 | | Bill Sloman |
| 7 Feb 26 | Re: Is the universe infinite, or does it have a limit? | 2 | | Jan Panteltje |
| 7 Feb 26 | Re: Is the universe infinite, or does it have a limit? | 1 | | Bill Sloman |
| 7 Feb 26 | Re: Is the universe infinite, or does it have a limit? | 3 | | Thomas 'PointedEars' Lahn |
| 7 Feb 26 | Re: Is the universe infinite, or does it have a limit? | 2 | | Bill Sloman |
| 7 Feb 26 | Re: Is the universe infinite, or does it have a limit? | 1 | | Thomas 'PointedEars' Lahn |
| 6 Feb 26 | Re: Is the universe infinite, or does it have a limit? | 19 | | Nioclás Pól Caileán de Ghloucester |
| 7 Feb 26 | Re: Is the universe infinite, or does it have a limit? | 18 | | Thomas 'PointedEars' Lahn |
| 7 Feb 26 | Re: Is the universe infinite, or does it have a limit? | 17 | | Nioclás Pól Caileán de Ghloucester |
| 7 Feb 26 | Re: Is the universe infinite, or does it have a limit? | 16 | | Thomas 'PointedEars' Lahn |
| 7 Feb 26 | Re: Is the universe infinite, or does it have a limit? | 2 | | john larkin |
| 7 Feb 26 | Re: Is the universe infinite, or does it have a limit? | 1 | | Thomas 'PointedEars' Lahn |
| 7 Feb 26 | Re: Is the universe infinite, or does it have a limit? | 1 | | Thomas 'PointedEars' Lahn |
| 8 Feb 26 | Re: Is the universe infinite, or does it have a limit? | 2 | | Nioclás Pól Caileán de Ghloucester |
| 8 Feb 26 | Re: Is the universe infinite, or does it have a limit? | 1 | | Martin Brown |
| 8 Feb 26 | Re: Is the universe infinite, or does it have a limit? | 10 | | john larkin |
| 9 Feb 26 | Re: Is the universe infinite, or does it have a limit? | 7 | | Thomas 'PointedEars' Lahn |
| 9 Feb 26 | Re: Is the universe infinite, or does it have a limit? | 6 | | john larkin |
| 9 Feb 26 | Re: Is the universe infinite, or does it have a limit? | 5 | | Jeroen Belleman |
| 9 Feb 26 | Re: Is the universe infinite, or does it have a limit? | 2 | | Jan Panteltje |
| 9 Feb 26 | Re: Is the universe infinite, or does it have a limit? | 1 | | Jeroen Belleman |
| 9 Feb 26 | Re: Is the universe infinite, or does it have a limit? | 2 | | Thomas 'PointedEars' Lahn |
| 9 Feb 26 | Re: Is the universe infinite, or does it have a limit? | 1 | | Thomas 'PointedEars' Lahn |
| 9 Feb 26 | Re: Is the universe infinite, or does it have a limit? | 2 | | Jeroen Belleman |
| 9 Feb 26 | Re: Is the universe infinite, or does it have a limit? | 1 | | Thomas 'PointedEars' Lahn |
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