Observations of star clusters in the Milky Way defy the view that the constituents of these systems are almost invariably chemically alike. The outlying clusters could be the tattered relics of once larger systems.
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Cohen, J. Assortment in the Galaxy. Nature 462, 421–422 (2009). https://doi.org/10.1038/462421a
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DOI: https://doi.org/10.1038/462421a
