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Systematic studies1–4 have revealed hundreds of ultra-compact dwarf galaxies (UCDs5) in the nearby Universe. With half-light radii rh of approximately 10–100 parsecs and stellar masses M  ≈ 106–108 solar masses, UCDs are among the densest known stellar systems6. Although similar in appearance to massive globular clusters7, the detection of extended stellar envelopes4,8,9, complex star formation histories10, elevated mass-to-light ratio11,12 and supermassive black holes13–16 suggest that some UCDs are remnant nuclear star clusters17 of tidally stripped dwarf galaxies18,19, or even ancient compact galaxies20. However, only a few objects have been found in the transient stage of tidal stripping21,22, and this assumed evolutionary path19 has never been fully traced by observations. Here we show that 106 galaxies in the Virgo cluster have morphologies that are intermediate between normal, nucleated dwarf galaxies and single-component UCD

United statesObservatorio astronomicoBurrell schmidtVirgo clusterGeneration virgo clusterGeneration virgo cluster surveyFornax clusterMax propertiesVirgo cluster surveyIt nuclearNext generation virgo clusterMilky way sizedCluster surveyCanada france hawaii telescopeHubble spaceNext generation virgo cluster survey