I believe in most scientific theories, but I really don’t buy dark matter.   It is supposed to make up 3/4 of the universe, but no one has detected it.  It reminds me a lot of aether.  It is just something thrown out there to explain why the observed universe does not match the theoretical universe.  I think we are missing one or more of three possibilities:

1. Our theories about gravity are a little off, unlikely, but possible.
2. There is another long distance binding force holding the universe together.
3. We live in a multidimensional universe where what we think is dark matter is just ordinary mass effecting other masses in a dimension we cannot perceive.

Yeah, it is a little esoteric for a blog posting, but I just wanted to write down what I thought.