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What is a globular cluster? An observational perspective

D'Orazi, Valentina; Gratton, Raffaele; Bragaglia, Angela +3 more

Globular clusters are large and dense agglomerate of stars. At variance with smaller clusters of stars, they exhibit signs of some chemical evolution. At least for this reason, they are intermediate between open clusters and massive objects such as nuclear clusters or compact galaxies. While some facts are well established, the increasing amount o…