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This is a totally idiotic requirement.>>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.
>
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