Seyfert Galaxies
(seyfertgalaxies.com)
Almost all Seyfert galaxies are spiral galaxies and have been among the most intensively studied objects in astronomy, primarily because they are thought to be nearby, low-luminosity versions of the same phenomenon observed in quasars.
Almost all Seyfert galaxies are spiral galaxies and have been among the most intensively studied objects in astronomy, primarily because they are thought to be nearby, low-luminosity versions of the same phenomenon observed in quasars.