What evidence do we have that supports that quasars are the nuclei of very distant galaxies?
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Quasars are part of a class of objects known as active galactic nuclei (AGN). Other classes include Seyfert galaxies and blazars. All three require supermassive black holesto power them. Seyfert galaxies are the lowest energy AGN, putting out only about 100 kiloelectronvolts (KeV)
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