quasar

noun

distant active galactic nucleus

Wiktionary

Pronunciation: /ˈkweɪ.zɑː/ / /ˈkweɪ.zɑɹ/

noun

Etymology: Blend of quasi- + stellar, from quasi-stellar radio source. Coined by American astrophysicist Hong-Yee Chiu in 1964 in an article in Physics Today. By surface analysis, quasi- + -ar.

An extragalactic object, starlike in appearance, that is among the most luminous and (putatively) the most distant objects in the universe.