The discovery of multiple stellar populations — formed at different times — in several young star clusters adds to the debate on the nature and origin of such populations in globular clusters from the early Universe. See Letter p.502
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References
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Nota, A., Charbonnel, C. The mystery of globular clusters. Nature 529, 473–474 (2016). https://doi.org/10.1038/529473a
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DOI: https://doi.org/10.1038/529473a
