Dark matter maps for a sample of 50 individual galaxy clusters (left), an average galaxy cluster (center), and those based on dark matter theory (right). The density of dark matter increases in the order of blue, green, yellow, and red colors. The white horizontal line represents a scale of 1 million light-years. The map based on predictions from CDM theory (right, middle) is a close match to the average galaxy cluster observed with the Subaru Telescope. // NAOJ/ASIAA/School of Physics and Astronomy, University of Birmingham/Kavli IPMU/Astronomical Institute, Tohoku University