Most nearby young clusters exhibit anisotropic plane-of-sky expansion and surviving hierarchical structure even at ages >30 Myr, implying substructured formation and often younger kinematic ages than isochronal ages.
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Expansion kinematics of young clusters. III. The kiloparsec sample
Most nearby young clusters exhibit anisotropic plane-of-sky expansion and surviving hierarchical structure even at ages >30 Myr, implying substructured formation and often younger kinematic ages than isochronal ages.