The heated debate on the importance of stellar rotation and age spreads in massive star clusters has just become hotter by throwing stellar variability into the mix.
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de Grijs, R. Star clusters: Anything but simple. Nat Astron 1, 0011 (2017). https://doi.org/10.1038/s41550-016-0011
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DOI: https://doi.org/10.1038/s41550-016-0011
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