What If (Stars,and Galaxies)

Stars have all the elements inside them.,and that means the nebula has
these 92 elements incorporated in them. I'm posting my thoughts that
"clumping" of stars,and galaxies are a big mystery. Has anyone studied
how galaxies formed? Is the big clue in galaxy clumping stars the fact
that they have a BH in their center? Does it take a black hole to clump
a nebula,so that it does not dilute into cold empty space? When we
find all that missing dark matter will it help answer this question? I
came up with vortexes in the nebula to create areas in the cloud where
stars would form. Reality is I'm using a swirling motion to help gravity
to compress. It fits well with my "Spin is in theory" Bert PS All
galaxies have to be created flat.when young. Round galaxies got their
shape by merging with flat galaxies. That makes good sense. Bert