How the Edge of Our Galaxy Defies Known Physics

What I don't get is how can we say that we've quantified the amount of matter in the universe at all! We can't even see the ends of the universe. We do not know how big it is. We aren't even sure of it's geometry (flat, positively or negatively curved). If we can't discern the total amount of mass in the universe, how can we quantify what is visible and what is apparently "missing"?

Since matter and energy are two distinct expressions of the same thing, isn't it possible that what is driving Galaxy spin dynamics is an amalgamation of gravity and electromotive force (due to bulk electric currents in the galactic filaments)? The 19 galaxies "discovered" so far that appear to have no "dark matter" may simply exist in an environment with either no active electrical current flow or they are currently at a null point in the bulk electric flow.

Isn't it curious that Galaxy spin axis are aligned with the filaments in which they reside? This is indicative of being an electromotively driven assist to gravity.