What is an Active Galactic Nucleus and Why is it Important?

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An Active Galactic Nucleus (AGN) is a region at the center of some galaxies that emits significant energy, often outshining the entire galaxy. AGNs are powered by supermassive black holes that accrete surrounding material, leading to the release of vast amounts of radiation across the electromagnetic spectrum. They are important for understanding galaxy evolution and the role of black holes in the universe. Resources for further information include NASA's educational materials and academic articles on AGNs. Exploring AGNs helps astronomers gain insights into cosmic phenomena and the structure of the universe.
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Can anyone inform me as to what an "active galactic nuclei" is? Thanks a lot!
 
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