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

Am 28.03.2024 um 07:29 schrieb Volney:

On 3/28/2024 2:12 AM, Thomas Heger wrote:

Am 18.03.2024 um 19:20 schrieb Ross Finlayson:

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A hypothesis ....
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... filling the space that is the agglomeration of what was their jet.
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So, are there gravitic singularities in the middle of galaxies?
Maybe not.
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Are there gravitic filaments holding it all together?  Maybe not.
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My personal view on this problem:
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galaxies are not held together by gravity and there is no need for
gravity, because the galaxies are not rotating in their own frame of
reference.
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It is OUR !!! impression from a remote position, that galaxies rotate.
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But seen from a comoving position from within that galaxy, the
galaxies (of course) don't rotate.
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Rotation is absolute. If a galaxy is rotating, that it is rotating can
be detected either from within or without the galaxy.

'Absolute' is a dangerous term in cosmology, because relativity says, that space itself is not absolute.
IOW: relativity requires a reference to something, if you like to define movement (in respect to that something).
Space itself cannot be used, because relativity says, that absolute space does not exist.
So, something else is required.
But what shall we take???
I assume, that the observer can be used and actually is used as 'base', from where the universe is observed.
But that would make it impossible to measure the state of motion of the observer, because the observer does not move in repect to himself.
If now the observer rotates (unknowingly) he would see the universe rotating the other way round.
Since what we call 'universe' is only a subset of 'everything in existence', there are possibly 'sub-universes', which seemingly rotate, while that rotation is only an optical illusion, caused by the movements of the observer and the finite speed of light.
TH