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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: Tue, 09 Apr 2024 08:47:18 +0200
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Am 05.04.2024 um 10:20 schrieb Mikko:

>>>> In this case a vortex is actually a structure of significant depth,
>>>> where stars are stacked in distance, hence also 'stacked in time' (in
>>>> the image).
>>>
>>> Why would you want to explain someting that is never seen?
>>
>> Theoretical physics does not require visibility.
>
> Study of phantasies is not physics of any kind.
>
>> Interesting are phenomenons which exist, whether they are visible or not.
>
> They are interesting only if they are observed to exist or there is
> a good reason to expect that they can be observed.
>
>> E.g. a ship on the other side of the planet cannot be seen from here
>> or the other side of the Moon.
>
> Both can be seen.
>
>> But both do exist.
>>
>> Visibility, usefulness or other categories of this kind, which reflect
>> a connection to the observer, are irrelevant in physics.
>
> Everything in physics has a connection to an observer.
>

This is a totally idiotic requirement.

Many things cannot be seen, even if they are real.

Seeing is limited to light of a very small frequency band, limited to 
direct visibility and also limited by scale, time of existence and 
illumination.

We also need somebody to watch.

But many things real do not fall into these categories.


E.g. very short lived particles are very hard to see.

Also invisible are radiowaves, the inside of planet Earth or of black holes.

But would you like to shuffel all things under the rug, which are hard 
to see?


TH