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Abell 520

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NASA's Hubble Space Telescope has spotted what appears to be a clump of dark matter in an area known as Abell 520 - a huge cluster of galaxies some 2.4 billion light years away. Image Credit: Credit: NASA, ESA, CFHT, CXO, M.J. Jee (University of California, Davis), and A. Mahdavi (San Francisco State University)

Dark Matter Core Defies Explanation in NASA Hubble Image

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