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 fractionof the energy outputis not emittedby the normal componentsof a galaxy.
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