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BIG BLUE
This optical image, taken by the Large Binocular Telescope in Safford, Arizona, confirmed that the fuzzy blue dot is 2XMM J083026+524133 — the most massive, distant cluster of galaxies found to date. The blue represents the cluster’s X-ray emissions.Full Story Credit: ESA XMM-Newton, EPIC, LBT, LBC, AIP, J. Kohnert

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