active galactic nuclei (AGN)

What is active galactic nuclei (AGN)?

active galactic nuclei (AGN) definition and meaning on Science terms:
A class of galaxies which spew massive amounts of energy from their centers, far more than ordinary galaxies. Many astronomers believe supermassive black holes may lie at the center of these galaxies and power their explosive energy output.

 

reference: https://imagine.gsfc.nasa.gov/resources/dictionary.html

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