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Newly discovered Goliath galaxies from early universe hint at massive dark matter trove

(Simons Foundation) A newfound pair of galaxies from the early universe is so massive that it nearly breaks the current understanding of how the cosmos evolved. The larger of the pair is the heftiest galaxy ever seen from the first billion years of the universe. Two galactic giants in such proximity suggest the presence of an enveloping dark matter halo equivalent to 1 trillion times the sun's mass, nearly as large as physically possible at the time.
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