I append the following because it is directly relevant to OP
, and because it refers to the largest structures in the Universe
, and because it is absolutely current.
I suggest/request that any reference to relative
be forbidden as irrelevant
. This being in accordance with Post #3 viz 'covered in your first thread'.
It is offered as relevant to OP and for information/interest only.
The largest structures in the Universe are spinning
Astronomy Now August 2021
The research is published in the 14 June issue of Nature Astronomy
The huge filaments of matter that criss-cross the Universe in a 'cosmic web' are rotating, and are the largest structures ever found to do so, according to observations of the motions of galaxies within the filaments.
The cosmic web is how matter organises itself across the Universe . . . . . . . . . Using data from the Sloan Digital Sky Survey to study the motions of hundreds of thousands of galaxies that line the filaments (it was found that) the filaments
rotate along their length, which extends for hundreds of millions of light years. . . . . . . . .
The galaxies 'move on helixes or corkscrew like orbits, circling round the middle of the filament while travelling along it'. Such a spin has never been seen before on such enormous scales. . . . . . . . . .