active galaxy

noun

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

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Meanings

nounactive galaxy (plural active galaxies)

plural active galaxies

  1. astronomyA galaxy where a significant fraction of the energy output is not emitted by the normal components of a galaxy.
  2. by restrictionA galaxy with an active nucleus (AGN, active galactic nucleus)
Cite this entry
APA

active galaxy. (n.d.). In WatkinsX Dictionary. Retrieved November 3, 2026, from https://dictionary.watkinsx.com/word/active%20galaxy

MLA

“active galaxy.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/active%20galaxy. Accessed November 3, 2026.

Chicago

WatkinsX Dictionary, s.v. “active galaxy,” accessed November 3, 2026, https://dictionary.watkinsx.com/word/active%20galaxy.

Source: active galaxy on Wiktionary, CC BY-SA 4.0.