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Science at Nasa: Science Casts: Big Mystery in the Perseus Cluster

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A mysterious X-ray signal from the Perseus cluster of galaxies, which researchers say cannot be explained by known physics, could be a key clue to the nature of Dark Matter. (July 21, 2014) [3:42]

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dark matter, space research, scienceatnasa, scienceatnasa: sciencecasts: big mystery in the perseus cluster
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