a huge cluster is called
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A supercluster is a large group of smaller galaxy clusters or galaxy groups; it is among the largest-known structures of the cosmos.
The large size and low density of superclusters means they, unlike clusters, expand with the Hubble expansion.
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galaxy group and clusters are also known gravitational bound object to have arisen thus far in the process of cosmic structure formation . The cluster themselves are often associated larger , non gravitational bound group called super cluster .
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