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HERCULES CLUSTER OF GALAXIES470 million light-years The Hercules Cluster contains approximately 100 galaxies. This large collection provides a showcase for the main types of galaxies: ellipticals, spirals and irregulars. The group is only 470 million light-years away, a stone’s throw in astronomical terms. Scientists study this cluster to learn how galaxies interact with one another. Credit: Canada-France-Hawaii Telescope / Coelum / J.-C. Cuillandre & G. Anselmi. |