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Active galactic nucleus
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Compact region at a galaxy's center with abnormally high luminosity
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An active galactic nucleus (AGN) is a compact region at the center of a galaxy that emits a significant amount of energy across the electromagnetic spectrum, with characteristics indicating that this luminosity is not produced by the stars. Such excess, non-stellar emissions have been observed in the radio, microwave, infrared, optical,...

Instance of
astronomical object type
Subclass of
Galaxy
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