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star cluster

noun, Astronomy
a number of stars of common origin held together as a group by gravitational attraction. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Encyclopedia Article for star cluster

either of two general types of stellar assemblages held together by the mutual gravitational attraction of its members, which are physically related through common origin. The two types are open (formerly called galactic) clusters and globular clusters.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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