The Perseus–Pegasus Filament is a galaxy filament containing the Perseus–Pisces Supercluster and stretching for over a billion light-years (or over 300/h Mpc). Currently, it is considered to be one of the largest known structures in the universe. As part of the larger Pisces–Cetus Supercluster Complex, this filament is adjacent to the Pisces–Cetus Superclusters, the core and most prominent component of the complex.
Discovery While the Perseus–Pegasus Filament was formally discovered by David Batuski and Jack Burns of New Mexico State University in 1985, it is likely that the Lowell Observatory's Clyde Tombaugh, best known for being the discoverer of Pluto, was aware of its existence in 1936 while conducting his search for trans-Saturnian planets. He reported it as the Great Perseus-Andromeda stratum of Extra-Galactic Nebulae. Earlier still, parts of this clustering had been reported by Walter E. Bernheimer.
See also Abell catalogue Large-scale structure of the universe Supercluster Big Ring
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