Globular Clusters are a spherical collection of stars that orbit a galactic core as a satellite. They are tightly bound by gravity, which give them a relatively high stellar density and spherical shape. Globular Clusters are found in the Halo of galaxies, and are much older and denser than Open Clusters, which are found in a galaxy's disk.  There are about 150 known Globular Clusters in the Milky Way.
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