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Definition of GLOBULAR CLUSTER
: any of various approximately spherical clusters of gravitationally associated stars that typically populate galactic halos —called also globular
First Known Use of GLOBULAR CLUSTER
Any large group of old, Population II (seePopulations I and II) stars closely packed in a symmetrical, somewhat spherical form. About 150 have been identified in the Milky Way Galaxy. Most are distributed in a spherical volume above and below the Galaxy's disk (seegalactic halo). Globular clusters contain many more stars (10,000–1,000,000) than open clusters do and can be several hundred light-years in diameter. Because they are so distant from the solar system, most are not visible to the unaided eye. Omega Centauri and a few others can be seen without a telescope as hazy patches of light.