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Recent studies have shown that the extended main-sequence turn off (eMSTO) isa common feature of intermediate-age star clusters in the Magellanic Clouds(MCs). The most simple explanation is that these stellar systems harbormultiple generations of stars with an age difference of a few hundred Myrs.  However, while an eMSTO has been detected in a large number of clusters withages between ~1-2 Gyrs, several studies of young clusters in both MCs and innearby galaxies do not find any evidence for a prolonged star-formationhistory, i.e. for multiple stellar generations. These results have suggestedalternative interpretation of the eMSTOs observed in intermediate-age starclusters. The eMSTO could be due to stellar rotation mimicking an age spread orto interacting binaries. In these scenarios, intermediate-age MC clusters wouldbe simple stellar populations, in close analogy with younger clusters.  Here we provide the first evidence for an eMSTO in a young stellar cluster.We exploit multi-band Hubble Space Telescope photometry to study the ~300-Myrold star cluster NGC1856 in the Large Magellanic Cloud and detected a broadenedMSTO that is consistent with a prolonged star-formation which had a duration ofabout 150 Myrs. Below the turn-off, the MS of NGC1856 is split into a red andblue component, hosting 33+/-5% and 67+/-5% of the total number of MS stars,respectively. We discuss these findings in the context ofmultiple-stellar-generation, stellar-rotation, and interacting-binaryhypotheses.

Multiple stellar populations in Magellanic Cloud clusters. III. The first evidence of an extended main sequence turn-off in a young cluster: NGC1856