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The Sloan Great Wall (SGW) is a cosmic structure formed by a giant wall of galaxies (a galaxy filament). Its discovery was announced from Princeton University on October 20, 2003, by J. Richard Gott III , Mario Jurić , and their colleagues, based on data from the Sloan Digital Sky Survey .
The Sloan Great Wall, the Pisces–Cetus Supercluster Complex, the Horologium-Reticulum Supercluster and the Shapley Supercluster as seen in the 2dF Galaxy Redshift Survey This is a list of the largest cosmic structures so far discovered.
The Hercules–Corona Borealis Great Wall (HCB) [1] [5] or simply the Great Wall [6] is a galaxy filament that is the largest known structure in the observable universe, measuring approximately 10 billion light-years in length (the observable universe is about 93 billion light-years in diameter).
This discovery surpasses the size of the Sloan Great Wall, a galaxy cluster that measured around 1.1 billion light-years in length and was discovered in 2003.
Sloan Great Wall (SDSS Great Wall) 2003 z=0.07804 433 Mpc long This was the largest known galaxy filament to be discovered, [22] until it was eclipsed by the Hercules–Corona Borealis Great Wall found ten years later. Sculptor Wall (Southern Great Wall, Great Southern Wall, Southern Wall) 8000 km/s long 5000 km/s wide
The BOSS Great Wall is one of the largest superstructures in the observable universe, [2] though there are even larger structures known. This figure shows the superclusters of the BOSS Great Wall, on Cartesian coordinates. The large complex has a mean redshift of z ~ 0.47 (z times Hubble length ≈ 6.8 billion light years). [1]
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The Great Wall of China cannot be seen by the naked human eye from the Moon. [71] Even though the myth is thoroughly debunked, it is still ingrained in popular culture. [72] [73] The apparent width of the Great Wall as seen from the Moon would be the same as that of a human hair viewed from 3 km (2 mi) away. [74]