Seyfert galaxy

noun

Sey·fert galaxy | \ ˈsē-fərt- also ˈsī-

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Definition of Seyfert galaxy

: any of a class of spiral galaxies that have small compact bright nuclei characterized by variability in light intensity, emission of radio waves, and spectra

— called also Seyfert

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The first known use of Seyfert galaxy was in 1959

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