Abell 520 is a large galaxy cluster situated 2.4 billion light years away. Data from the Hubble Space Telescope indicates that – very unusually - a core of dark matter was left behind after a number of galaxies in this area collided.
Image Credit: NASA, ESA, CFHT, CXO, M.J. Jee (University of California, Davis), and A. Mahdavi (San Francisco State University)
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