Since large-scale structures are gravitationally-bound ensemble of atoms and molecular matter, therefore, large-scale structures can be considered as gas molecules undergoing free expansion inside a vacuum chamber. I have found that free expansion of actual gas molecules is homogeneous and isotropic. Furthermore, expanding gas molecules exhibit the Hubble diagram. Expanding gas molecules obey the Hubble’s law and all Hubble equations.
https://www.researchgate.net/publication/329736665
Yes!
That's why studying gases is more interesting and useful than study galaxies & the universe.
The fundamental theoretical framework of large scale structures such as stars, galaxies, Black holes, Quasi stellar objects and super Novae are built upon two general theories of relativity and quantum field theory. Due to gravitational force of these massive objects and the expansion of the universe, these objects collide with each other and these collisions produce high energetic phenomena that allows the acceleration of particles. Another important observation is that light comes from these distant objects on a large scale in forms of photons energy.Extensive knowledge of space, time and energy in relation to large scale structures are required for better understanding of the phenomena
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