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Hercules Cluster (Abell 2151)

Hercules Cluster (Abell 2151)
A loose unsymmetrical cluster of about 75 bright galaxies, some 500 million light-years away in the constellation Hercules and about 6 million light-years across. It contains an unusually high proportion of spiral galaxies and also galaxies that shown evidence of interaction or other peculiar features (see galaxy interaction).

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