A study of one galaxy's dynamics backs up previous claims that surprisingly compact galaxies existed in the early Universe. But how such objects blew up in size to form present-day galaxies remains a puzzle.
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Glazebrook, K. Too small to ignore. Nature 460, 694–695 (2009). https://doi.org/10.1038/460694a
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DOI: https://doi.org/10.1038/460694a
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