Active Galactic Nucleus Definition
noun
A galactic nucleus that emits more radiation than can be accounted for solely by light from the stars it contains.
American Heritage
(astronomy) A compact region at the center of a galaxy that has a much higher than normal luminosity over at least some portion, and possibly all, of the electromagnetic spectrum.
Wiktionary
Other Word Forms of Active Galactic Nucleus
Noun
Singular:
active galactic nucleus
Plural:
active-galactic-nuclei
Active Galactic Nucleus Is Also Mentioned In
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