If dark matter is actually there and not just some flaw in our understanding or mathematics then how can galaxies be made of both and not just one or the other. If dark matter doesn't interact with anything else like light then how can a dwarf galaxy be made of "mostly dark matter"?I know its probably just a misunderstanding of mine, but right now it really seems like dark matter is a scape goat. Do a lot of experts share this hypothesis? What are some other reasons why physicists believe dark matter is there, other than its gravitational effects on the movement of galaxies? Or is that pretty much it? (I understand this is a big deal, ha) and finally, what are the leading theories that explain dark matter and which do you support?