Tuesday 2 January 2018 photo 18/116
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Unexpected X-Rays from Perseus Galaxy Cluster
Image Credit: X-ray: NASA/CXO/Oxford University/J. Conlon et al.; Radio: NRAO/AUI/NSF/Univ. of Montreal/Gendron-Marsolais et al.; Optical: NASA/ESA/IoA/A. Fabian et al.; DSS
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