Most scientists are too stuck on what they think rather than what reality is telling them.... Long story short.... Dark matter doesn't exist. The "extra gravity" in the universe is actually a result of the dodecehedral mass distribution in the universe which has been proven to produce gravity. If you care to read about someone who lays out many of the flaws with mainstream physics please read Dewey B Larson's book "nothing but motion" or Dan winter(fractal field.com) who clearly shows with highly accurate conceptual and mathematic formulas how and why gravity is formed as well as how to produce gravity. Take a look and enjoy
RE: Physics in the Dark: Searching for the Universe’s Missing Matter