Cosmos Universe Wiki

Huge-LQG is a structure of 73 quasars 9 billion light-years away in the constellation Leo. About 4 billion light-years across - three times longer than the upper limit to the homogeneity scale, the Huge-LQG as well as several other large-scale structures challenge our understanding of the universe.

A large quasar group (LQG) is a collection of quasars (a form of supermassive black hole active galactic nuclei) that form what are thought to constitute the largest astronomical structures in the observable universe. LQGs are thought to be precursors to the sheets, walls and filaments of galaxies found in the relatively nearby universe.

Prominent LQGs[]

On January 11, 2013, the discovery of the Huge-LQG was announced by the University of Central Lancashire, as the largest known structure in the universe by that time. It is composed of 74 quasars and has a minimum diameter of 1.4 billion light-years, but over 4 billion light-years at its widest point. According to researcher and author, Roger Clowes, the existence of structures with the size of LQGs was believed theoretically impossible. Cosmological structures had been believed to have a size limit of approximately 1.2 billion light-years.


An artist's impression of a single quasar powered by a black hole with a mass two billion times that of the Sun

See also[]

  • List of largest cosmic structures
  • Large-scale structure of the cosmos
  • Quasar