Unexpected interaction between dark matter and ordinary matter in mini-spiral galaxies "We studied 36 galaxies, which was a sufficient number for statistical study. By doing this, we found a link between the structure of ordinary, or luminous matter like stars, dust and gas, with dark matter." “dark matter, according to the most hypotheses, would be non-baryonic or WIMP. It would not interact with ordinary matter except through gravitational force. Our observations, however, disagree with this notion."