Great and clear video

The Horizon problem can find an answer in Tesla.

He measured light as it leaves the source as 3x faster than Einstein`s speed.

This could figure into an equation of a different energy level of the universe. This is at an earlier time when pairing of electrons and neutrons can release photons.

In researching cold and how water acts in cold, we see -40°C is when atomic structures are crystalized and motion ends.

Not too many of us experience minus forty feels just as cold as minus fifty-five because the end of molecular motion in water.

And so we see Dark Matter occurs at sole galaxy level, not at cluster level as galaxies produce a sticky substance few have fathomed.

There can be different conditions at different times.