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Clusters Of Galaxies

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Digging up a dinosaur in a galaxy cluster

Galaxy clusters are the biggest gravitationally-bound objects in the Universe, millions of light years across, some as massive as a quadrillion (10^15) suns. They contain thousands of galaxies and are filled with 100-million-degree plasma, so tenuous it is a million times less dense than the... click to read more

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published on Dec 17, 2020