Only 15% of stars are formed alone inside their nebula nursery. The remainder are members of star clusters, of which there are two main types: open (or galactic) clusters and globular clusters. A third type, exemplified by OB associations, represents larger and looser collections, in this case of hot young stars. From our position in a spiral arm of the Milky Way, we can see many examples of both open and globular clusters. Although they share the same type of name — cluster — they could best be described as distant cousins.
KeywordsOpen Cluster Globular Cluster Star Cluster Large Magellanic Cloud Core Collapse
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