quasar

A compact, extremely bright celestial object whose power output can be hundreds to several thousand times that of the entire Milky Way galaxy. Quasars are among the most distant objects in the universe and are generally considered to be a form of active galactic nucleus.

An extragalactic object, starlike in appearance, that is among the most luminous and thought to be the most distant objects in the universe.

a starlike object that may send out radio waves and other forms of energy; many have large red shifts