Cosmic collision reveals dark matter

Yet more evidence that the physical world we see and believe we understand is only a portion of what is "out there", scientists believe they have evidence for the theory of dark matter. According to observations, scientists calculate that the Universe is comprised of only 5 percent "normal" matter, the rest is dark matter (25%) and dark energy (70%). According to reports, the collision between two clusters of galaxies actually split dark matter and normal matter, so that their energy signatures can be observed. source: http://www.msnbc.msn.com/id/14453775/