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Young star clusters (YSCs) with resolved stellar populations are well suitedfor studying star-cluster formation. In most cases, the (pre-main-sequence)stellar populations found in the YSCs are coeval with an intrinsic age spreadof up to 1Myr. Such observations can be understood as the YSCs having formed inone burst, which star formation was truncated by stellar feedback. The recentdiscovery that the colour-magnitude diagram of the Orion Nebula Clusters (ONC)contains three well defined age-separated populations appears to shatter thismodel. The implication is that the ONC formed in three bursts, with starformation still on-going in the last burst. We present new observationalresults focusing on the three populations in the ONC using OmegaCAM photometryand Gaia DR2 measurements. We also describe a theoretical model which mayexplain these observations by an interplay between stellar feedback and clusterdynamics.

Multiple bursts of star formation in young star clusters: The case of the Orion Nebula Cluster