The extremely energetic early stage in the formation of an active galaxy, characterized by an output of radiation
Quasi stellar objects. Quasars are star like objects that give off more energy than 100 galaxies combined. They are perhaps the most distant objects yet detected in the universe. Many attempts have been made to interpret their behavior.
Originally, a distant, highly luminous object that looks like a star. Strong evidence now exists that a quasar is produced by gas falling into a supermassive black hole in the center of a galaxy. [More Info: Field Guide
Compact, extra galactic, objects at extreme distances, which are highly luminous. They are thought to be active galactic nuclei. The name is an acronym for quasi-stellar radio source. A quasar is very similar to a QSO (quasi-stellar object) but gives out radio waves also.
Quasi-stellar radio sources (quasars) were first detected by virtue of their radio transmissions and appear to show the small bright centres of distant galaxies (although some believe that they are not as far away as people imagine but are moving at high speeds).
The most powerfully radiant objects in the universe, typically emitting more energy than a thousand normal galaxies from a volume only one trillionth that of a normal galaxy.