Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • 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.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

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

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