| 11. | At the core, most galaxies have a supermassive black hole, which may result in an active galactic nucleus.
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| 12. | At the core is a supermassive black hole, which forms the primary component of an active galactic nucleus.
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| 13. | "' SN 1992bd "'was a type II supernova event in 3 east and 93 south of the galactic nucleus.
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| 14. | It shows the galaxy NGC 5972, which once had an Active galactic nucleus which has turned off ('off duty').
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| 15. | In the mid-infrared range, the spectrum shows indications of high ionization levels usually associated with an active galactic nucleus.
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| 16. | The Galactic Center is marked by an intense inactive galactic nucleus, being estimated at around y " 1.
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| 17. | At the core of the galaxy is a low-luminosity active galactic nucleus which has formed an H II region.
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| 18. | Due to its relative proximity, large size and active galactic nucleus, Messier 81 has been studied extensively by professional astronomers.
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| 19. | The galaxy's location relatively near Earth and its active galactic nucleus make it a commonly studied object for professional astronomers.
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| 20. | It has a Seyfert 2 active galactic nucleus, and is one of the most extreme examples of a Seyfert galaxy.
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