I have no idea how many.
all the universes combined might just be particles of some atom.

everything seems to form a spherical shape , because of gravity.

but , galaxies seem flat.

this is because time.

we see a flat solar system , flat galaxies , you have mentioned a flat universe.


when we finaly get to look at a motionless atom we may see a flat atom.



what we see in our little short billionth of a second lifetimes
compared to the universes lifetime just appears flat to us , actually it is spinning really fast , so fast that everything looks like a sphere.

I cant see that the universe would freeze , I cant see a reason
unless theres some scientist out there pointing a laser beam into the atom that we are inside of.










3/4 inch of dust build up on the moon in 4.527 billion years,LOL and QM is fantasy science.