The structure exists, but by current theories and models, it really shouldn’t exist because it’s too big. The Sloan Digital Sky Survey found a huge quasar group some years back that very clearly is there, but it challenges what we know about large-scale structures in the Universe.
Just how do we conclude that the Large Quasar Group is too big? One of the assumptions astronomers gather from Einstein’s General Theory of Relativity, is at this large of a scale, the universe should look relatively (pun intended) uniform in all directions. More scientifically stated: On a sufficiently large scale, the properties of the universe are the same for all observers.
The LQG has 73 members spanning 4 Billion light years. Other astrophysical models suggest that 1.2 Billion light years was the upper limit for cosmic structures.
This limit was derived from computer modeling by a team led by Jaswant Yadav working in the Korea Institute for Advanced Study in 2010.
A team led by Clowes, an astronomer at the University of Central Lancashire in England, used data that was publicly available from the SDSS and data from the Apache Point Observatory in New Mexico.
To have a better understanding of the size of this behemoth (4 Billion light years), take our galaxy the Milky Way. Our galaxy is a puny 100,000 light-years across. Our host galaxy cluster, the Virgo Cluster, is a measly 100 Million light years across.