Active Galaxy Definition

noun
A galaxy that is many times brighter than other galaxies of the same type. Active galaxies commonly emit most of their excess luminosity from a compact active galactic nucleus.
American Heritage

(astronomy) A galaxy where a significant fraction of the energy output is not emitted by the normal components of a galaxy.

Wiktionary

Other Word Forms of Active Galaxy

Noun

Singular:
active galaxy
Plural:
active galaxies

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active galaxy