A substantial population of previously unknown massive dusty galaxies during the first two billion years after the Big Bang have been identified with submillimetre observations. They may solve some outstanding puzzles related to the formation and evolution of most massive galaxies in the Universe today.
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Cooray, A.R. Optically dark massive galaxies. Nat Astron 3, 885–886 (2019). https://doi.org/10.1038/s41550-019-0894-9
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DOI: https://doi.org/10.1038/s41550-019-0894-9
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