(Coma Wall, CfA2 Great Wall)
(large slab of galaxies)
The Great Wall is a Large Scale Structure element
discovered in 1989 in the CfA Redshift Survey.
It is 300 million light-years away and is 500 million
light-years by 300 million light-years by
16 million light-years.
Across the sky, it is a long area,
diagonally spanning hours 8 to 17 and about 0 to +50 degrees.
It includes the Hercules Supercluster,
the Coma Supercluster and the Leo Cluster.
Other larger structures ("Great Walls")
have been discovered since such
as the Sloan Great Wall and the
Hercules-Corona Borealis Great Wall.
(large scale structure)
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Large Scale Structure (LSS)
Sloan Great Wall (SGW)