Only a small fraction of the stuff in the universe is visible.
You confidently state that you can’t see much of the matter that exists.
(dark matter).
take a look at this — what is your opinion?
http://www.space.com/15333-dark-matter-missing-sun.html
If dark matter (at a very high rate in our universe, somewhere near 70%) does not in fact exist, then most mathematical models of universe formation collapse.