Huge-LQG
Above: Map of the Huge-LQG noted by black circles, adjacent to the Clowes–Campusano LQG in red crosses. Map is by Roger Clowes of University of Central Lancashire. Bottom: Image of the bright quasar 3C 273. Each  black circle and red cross on the upper image map is a quasar similar to this one.
The Huge Large Quasar Group, (Huge-LQG, also called U1.27) is a possible structure or pseudo-structure of 73 quasars, referred to as a large quasar group, that measures about 4 billion light-years across. At its discovery, it was identified as the largest and the most massive known structure in the observable universe, though it has been superseded by the Hercules–Corona Borealis Great Wall at 10 billion light-years. There are also issues about its structure (see Dispute section below).