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.
Until the discovery of the Huge-LQG in November 2012, it was the largest known structure in the universe, beating Clowes–Campusano LQG's 20-year record as largest known structure at the time of its discovery.
The Advances in Electrical and Electronic Engineering is a peer-reviewed periodical scientific journal aimed at publishing research results of the Journal focus areas.
Such a star can be smaller than the progenitor star's Schwarzschild radius and have a gravitational pull so strong that some light, but not all photons, can escape.[ citation needed] The Q stands for a conserved particle number.
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