The Sloan Great Wall is a giant wall of galaxies (a galactic filament) and to the present day 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, classified as the supercluster SCl 126 in SIMBAD, is nearly three times longer than the CfA2 Great Wall of galaxies, the previous record-holder, which was discovered by Margaret Geller and John Huchra of Harvard in 1989.
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