Astronomers noticed that the Abell 520 galaxy cluster has a massive dark core, which is presumably dark matter, though it is separated from any bright galaxies, which tends to upset established theories about the mysterious invisible cosmic substance. | Harper's Magazine

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Astronomers noticed that the Abell 520 galaxy cluster has a massive dark core, which is presumably dark matter, though it is separated from any bright galaxies, which tends to upset established theories about the mysterious invisible cosmic substance.

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Astronomers noticed that the Abell 520 galaxy cluster has a massive dark core, which is presumably dark matter, though it is separated from any bright galaxies, which tends to upset established theories about the mysterious invisible cosmic substance.

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