Dark Matter Core Defies Explanation in Hubble Image

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Object Name: Abell 520

Image Type: Astronomical/Illustration

Illustration Credit: NASA, ESA, and Z. Levay (STScI)

Image Credit: NASA, ESA, CFHT, CXO, M.J. Jee (University of California, Davis), and A. Mahdavi (San Francisco State University)

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