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The Sloan Great Wall (SGW) is a cosmic structure formed by a giant wall of galaxies (a galactic filament), and to the present day it is the largest known structure in the universe. Its discovery was announced on October 20, 2003, by J. Richard Gott III of Princeton University and Mario Jurić and their colleagues, based on data from the Sloan Digital Sky Survey. The wall measures 1.37 billion light years (1.30×1025 m) in length, which is approximately 1/60 of the diameter of the observable universe, and is located approximately one billion light-years from Earth.
The Sloan Great Wall, is 2.74 times longer than the CfA2 Great Wall of galaxies, which was discovered by Margaret Geller and John Huchra of Harvard in 1989. It contains several galactic superclusters, the largest and richest of which is named SCl 126. This is located in the highest density region of the structure. It is followed in size by the supercluster SCl 111.