Definitions
from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun A spiral galaxy having a small, compact nucleus many times brighter than the rest of the galaxy and exhibiting variable light intensity and radio emission. Seyfert galaxies are active galaxies thought to be powered by the accretion of material onto black holes in their galactic nuclei.
Etymologies
from The American Heritage® Dictionary of the English Language, 4th Edition
[After Carl Keenan Seyfert, (1911–1960), American astronomer.]
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