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Open star clusters are a group of usually a few thousand stars that are formed by the same large molecular cloud.  Stars in the open star cluster are young stars around a few hundred million of years old.  Open star clusters are loosely gravitationally bound to each other and radiation pressure from the cluster in time will disperse the cloud.

In contrast, globular clusters are very tightly bound by gravity and consist of much older stars.   There objects are found usually around the core of the galaxy and consist of server hundred thousand stars.  Both types of clusters are rich in color and details and make beautiful photographs.