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From: Thomas Heger <ttt_heg@web.de>
Newsgroups: sci.physics.relativity
Subject: Re: Galaxies don't fly apart because their entire frame is rotating
Date: Fri, 12 Apr 2024 07:45:29 +0200
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Am Donnerstag000011, 11.04.2024 um 13:08 schrieb Python:
> Le 11/04/2024 à 10:51, Thomas Heger a écrit :
>> Am 10.04.2024 um 15:30 schrieb J. J. Lodder:
>>
>>>>>>
>>>>>> Also, perhaps our current state of the art technology wrt 
>>>>>> observing the
>>>>>> universe from our little earth is damn near pre embryonic wrt the 
>>>>>> grand
>>>>>> scheme of things... ;^)
>>>>>>
>>>>>
>>>>> Usual observations from our perspective of the universe would 
>>>>> require to
>>>>> remove the effects of the delay, which is caused by the finite 
>>>>> speed of
>>>>> light.
>>>>>
>>>>> But this is not done.
>>>>
>>>> Of course it is done!!!
>>>>
>>>> You have definitely never read any paper about astronomy, or the 
>>>> history
>>>> of astronomy. As a matter of fact one of the main issue in astronomy is
>>>> to determine the distance of objects as precisely as possible.
>>>>
>>>> Thomas, why are you constantly making up stuff of that kind? Is it 
>>>> malice
>>>> or stupidity?
>>>>
>>>> Both?
>>>
>>> Hanlon's razor applies, I think.
>>>
>>> And for amusement: noting different delays of quasar fluctuations,
>>> in passing through an Einstein lens, is a practical way
>>> of establishing their cosmological distance,
>>
>> Sure, the delay is known.
>>
>> But how would you remove it?
>>
>> The difference in time is actually HUGE, hence you would need to wait 
>> a VERY long time, if you want to know the present position of stars 
>> seen a few billion light years away.
> 
> *facepalm*
> 
> Q. How to know what week day and month day will tomorrow be ?
> A. Wait 24 hours, then look at your phone

You should hit a little harder, because it's not just weaks nor even 
years you need to wait.

To measure the position of a star in one billion light years distance 
you need to wait a billion years, before you can actually see the light 
emitted from that star.

Because that is impossible, we simply don't know to were those stars 
went in the meantime.

We know that stars move around in the universe, but cannot tell, to were 
they went in the unobserved time of the last billion years.

It is therefore entirely pointless to figure out gravity between 
forground and background stars.

It may evetually be possible, to make plausible predictions about their 
future fate. But to do so, we would need to know, what cosmologists 
actually try to figure out: the influence of gravity by other objects.


> 
>> In the meantime cosmologists explain the positions of stars, which do 
>> not belong to the same time.
> 
> In the meantime cosmologists are not idiots, they know about physics 
> (while you do not).

Well, they are certainly smart enough to stay in they job.


TH