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.


Sorry, no etymologies found.


Help support Wordnik (and make this page ad-free) by adopting the word active galaxy.


    Sorry, no example sentences found.


Log in or sign up to get involved in the conversation. It's quick and easy.