The most luminous and some of the most distant of all objects in the universe. They radiate between 10 and 100,000 times as much energy as our entire galaxy from an energy source that is no larger than our solar system. Such a compact source may be a supermassive black hole surrounded by an accretion disk of matter falling into the hole. The matter is heated to millions of degrees, making the accretion disk glow brightly.

Radio Programs

Early Beacon A bright beacon in the early universe Friday, May 29, 2015
Quasars An astronomical contradiction Thursday, May 28, 2015
False Alarm A hint of an interstellar radio station Wednesday, May 27, 2015
Getting Away Escaping from a black hole in a hurry Friday, May 10, 2013
Quasars IV An astronomical navigation system Friday, February 8, 2013
Quasars III The glory days for a black hole Thursday, February 7, 2013
Quasars II Lighting up a distant galaxy Wednesday, February 6, 2013
Quasars The long-range secret of odd “stars” Tuesday, February 5, 2013
3C48 A quasi-stellar mystery Sunday, September 26, 2010

Featured Images

The powerful quasar SDSS J1106
Phenomenal Cosmic Power Friday, May 10, 2013
Artist's concept of a distant quasar
Fiery Galaxy Tuesday, February 5, 2013
A thick torus of dust encircles a quasar
Water Works Tuesday, September 13, 2011
Streamers of dust partially obscure the "seven sisters," members of the Pleiades
Veiled Sisters Wednesday, April 6, 2011
Infrared view of planetary nebula NGC 4361 in Corvus
Cotton-Candy Star Sunday, April 3, 2011
Hubble view of Hanny's Voorwerp and the galaxy IC 2497
In the Spotlight Tuesday, January 11, 2011


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