Re: Galaxies don't fly apart because their entire frame is rotating

On 2024-04-05 07:38:56 +0000, Thomas Heger said:

Am 31.03.2024 um 10:49 schrieb Mikko:
 

They noticed that the rotational speed of stars in most galaxies
cannot be explained by gravitation if you only take into account
the mass of the visible part of them. There is nothing silly in
trying to sort that out.
 

 I try to explain rotating galaxy vortices by foreground rotation of
the frame of reference of the observer.
 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.
--
Mikko