word
active galactic nucleus
AK-tiv gah-LAK-tik NYOO-klee-us
ˈæktɪv ɡəˈlæktɪk ˈnjuːkliəsListen
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Syllable breakdown
activegalacticnucleus
Dictionary meaning
a compact, extremely luminous region at the centre of a galaxy powered by accretion of matter onto a supermassive black hole; includes quasars, Seyfert galaxies, and blazars; AGN can outshine entire galaxies and drive powerful jets of relativistic plasma
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