Quasars

http://en.wikipedia.org/wiki/Quasar

"A **quasi-stellar radio source** (**"quasar"**, [|/] [|ˈ][|k][|w][|eɪ][|z][|ɑr] [|/] ) is a very energetic and distant [|active galactic nucleus]. Quasars are extremely luminous and were first identified as being high [|redshift] sources of [|electromagnetic energy], including [|radio waves] and [|visible light], that were point-like, similar to [|stars], rather than extended sources similar to [|galaxies]. While the nature of these objects was controversial until as recently as the early 1980s, there is now a [|scientific consensus] that a quasar is a compact region in the center of a massive galaxy, that surrounds its central [|supermassive black hole]. Its size is 10–10,000 times the [|Schwarzschild radius] of the [|black hole]. The quasar is powered by an [|accretion disc] around black hole."




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