The Perseus-Pisces Supercluster (SCl 40) is one of the largest known structures in the universe. Even at a distance of 250 million light-years, this chain of galaxy clusters extends more than 40° across the northern winter sky. The Perseus-Pisces Supercluster is one of two dominant concentrations of galaxies in the nearby universe (within 300 mil...
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http://en.wikipedia.org/wiki/Perseus-Pisces_Supercluster
One of the largest known structures in the universe. Even at a distance of 250 million light-years, this chain of galaxy clusters extends more than 40° across the northern winter sky.
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http://www.daviddarling.info/encyclopedia/P/Perseus-Pisces_Supercluster.htm
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