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Sey·fert galaxy | \ ˈsē-fərt- 
also ˈsī- \
also ˈsī- \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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Time Traveler for Seyfert galaxy
The first known use of Seyfert galaxy was in 1959
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