When ESA reported on a Hubble deep-field galaxy survey, they came within a whisker of stumbling over a connection which seems to largely evade modern astronomy:
The reheating, driven by the galaxies' ultraviolet starlight, transformed the gas between galaxies from a cold, dark hydrogen soup, to a hot, transparent plasma over only a few hundred million years.
OK, so if space is full of plasma, why not treat it as such?
Plasma is magnetically & electrically active, vastly different from the colder, gravity-driven cosmologies upheld of late.
So many features of galaxies — of our own solar system — make much more sense if interpreted as being formed relatively quickly by active plasma fields rather than by cold rocks rattling around loosely.
Comets are a classic example, radiating where they shouldn’t in unexpected ways. But it only starts there — so many planetary & lunar features yodel “plasma” that they almost defy counting.