Collection of quasars challenges limit on universe structure sizes

New Scientist : At 4 billion light years long the Huge-Large Quasar Group (LQG) spans one twentieth of the diameter of the observable universe. This discovery shatters what was believed to be the limit to the size of large scale structures in the universe. When Einstein was applying general relativity to the universe as a whole, he found it necessary to assume that there was no large-scale organization of matter. Later observations and calculations defined an upper-limit to the size of collections of galaxies of around 1 billion light years. Roger Clowes of the University of Central Lancashire, UK, and his colleagues were examining data from the Sloan Digital Sky Survey  when they discovered the cluster of 73 quasars. Clowes had previously been involved in the discovery of an LQG of 34 galaxies that was at the supposed size limit. Whether the new discovery means that Einstein’s cosmological principle is flawed, or the size limit just needs to be revised is still unclear.