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Gigantic clusters of galaxies pose a new dark-matter puzzle

Yellow, white and blue galaxies against a black background.

Among the galactic clusters examined by researchers seeking to understand the distribution of dark matter is MACSJ1206 (spread across centre of image), which distorts other galaxies’ light into smears and arcs. Credit: ESA/Hubble & NASA (CC BY 4.0)

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Nature 585, 327 (2020)




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