Galaxies, in terms of the scientific definition, don't exist. The things that we call galaxies are ULM (unknown luminous matter), which consists of predominantly CFM (crystalline firmament material).
The Space Narrative
The peer review driven popular science space narrative (SciPop) starts with the premise that the Bible is wrong and the Earth is billions of years old. It continues with the idea that stars are distant suns and galaxies.
Isaiah or Math?
Stars falling to Earth is unfulfilled prophecy. A standard belief among Christians is that God is faithful and true. He always keeps his promises. All prophecy has either been fulfilled or it will be fulfilled.
Sir Isaac Knew Tons
Sir Isaac Newton was fully aware that we could use words to define phenomena which were in fact unknown. Words are defined by what we use them for. It's a sublimely subtle form of induction.
Evidence for Synonymy
We're making a bold claim that stars aren't distant suns and galaxies. That's Galileo's bluff. The stars are fragments, and swirls of fragments, of reflective rock in the Kuiper and asteroid Belts.
Galileo’s bluff is the starting point for THE NARRATIVE of heliocentricity. It’s an induced rationalization of evidence to fit the premise, it’s not proof of heliocentricity.
The Role of Synonymy
Synonymy has primary and secondary roles. The primary is to make it seem as if the fulfillment of Biblical prophecy is impossible. In which case, if the Bible is the inerrant word of an omnipotent God, it's a fraud.
The Narrative of Heliocentricity
If it's good enough for Star Trek, it's good enough for popular science (SciPop). Besides, if you've seen it in a Star Trek episode you already believe it's true. Slam dunk.
Rolled Together as a Scroll
Is the phrase "the heavens shall be rolled together as a scroll" flowery poetic language or accurate physics? If the firmament is a rigid sphere of crystal on the edge of space, it's accurate physics.
The third axiom of mainstream science (SciPop) is stars are distant suns and galaxies. It's part of Galileo's Bluff. It's part of Galileo's Bluff, wishful thinking, an inductive rationalization of the premise that stars are distant suns and galaxies.