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Reference Terms
from Wikipedia, the free encyclopedia

Star cluster

Star clusters are groups of stars which are gravitationally bound.

Two distinct types of star cluster can be distinguished: globular clusters are tight groups of hundreds of thousands of very old stars, while open clusters generally contain less than a few hundred members, and are often very young.

Note:   The above text is excerpted from the Wikipedia article "Star cluster", which has been released under the GNU Free Documentation License.
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October 22, 2016

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updated 12:56 pm ET