Strange Radio Sources in Distant Galaxy Cluster Defy Our Understanding

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The Universe is littered with galaxy clusters – huge structures piled up at the intersections of the cosmic web. A single cluster can span millions of light-years across and be made up of hundreds, or even thousands, of galaxies. However, these galaxies represent only a few percent of a cluster's total mass. About 80 percent of it is dark matter, and the rest is a hot plasma "soup": gas heated ...

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