A composite image of the merging galaxy cluster Abell 520 shows the distribution of dark matter, galaxies, and hot gas. The orange picture shows the starlight from galaxies, while the blue picture shows the location of most of the mass in the cluster, which is dominated by dark matter (the dark-matter distribution is derived from gravitational lensing measurements). The green image shows regions of hot gas, and the natural-color photo of the galaxies was taken with NASA's Hubble Space Telescope and with the Canada-France-Hawaii Telescope in Hawaii.
CREDIT: NASA, ESA, CFHT, CXO, M.J. Jee (University of California, Davis), and A. Mahdavi (San Francisco State University)
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