What is another word for double quasar?
Pronunciation: [dˈʌbə͡l kwˈe͡ɪzɑː] (IPA) 
A double quasar, also known as a binary quasar or twin quasar, refers to a system of quasars that appear to be physically close to each other. These objects emit bright energy that can be observed in the visible and ultraviolet spectrum. In astronomical terms, double quasars are also referred to as dual quasars, pair quasars or twin active galactic nuclei. The term quasar is an acronym for quasi-stellar radio source, which describes the bright, distant objects that are similar in appearance to stars. Double quasars are important objects for studying the formation and evolution of galaxies and their supermassive black holes.
