- - Massive celestial object
- - astronomical object of very high luminosity found in the centres of some galaxies and powered by gas spiraling at high velocity into a large black hole
- - Very luminous and very distant astronomical object
- - Powerful starlike object
- - Massive, extremely distant celestial object
- - Luminous astronomical object
- - Its center is a black hole
- - Very bright celestial object
- - Highly luminous galactic object
- - Luminous outer space object
- - Very distant, very bright starlike object
- - Celestial object with large redshifts
- - Very distant celestial object
- - Distant galactic object
- - Celestial object with a large red shift
- - Luminous object in outer space
- - Starlike celestial object
- - Highly luminous cosmic object
- - It's like a star
- - Astronomical object with a large red shift
- - Starlike object
- - Celestial source of radio waves
- - Heavenly energy source
- - Pulsating thing
- - Luminous galactic nucleus
- - Energy source that may be 2 trillion times as bright as the sun
- - Certain radio source
- - Stellar radio source
- - Starlike source of radiation outside our galaxy
- - Black hole's locale
- - Distant radio wave source
- - Intense star-like source of light and radio waves
- - Distant radio source
- - Deep-space energy source
- - Faraway energy source
- - Distant radiowave source
- - Star look-alike
- - Distant energy source
- - Astronomical discovery of the 1960's
- - Cosmic radiator
- - Radio wave emitter
- - RCA alternative
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