| 21. | When passing through the disk, this cluster does so at distances of less than 5 kpc from the galactic nucleus.
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| 22. | Due to the relatively vast distances between stars outside the galactic nucleus, collisions between stars are thought to be rare.
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| 23. | Relativistic shocks are theoretically expected in gamma ray bursts, active galactic nucleus jets and in some types of supernova explosions.
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| 24. | NGC 4438 is a peculiar galaxy with an active galactic nucleus, at a distance of from Earth ( redshift 0.0035 ).
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| 25. | Similarly, the new discovery was made by observing the rotation of a disk of gas and dust surrounding a galactic nucleus.
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| 26. | The galaxy has a Seyfert 2 active galactic nucleus, and is one of the most extreme examples of a Seyfert galaxy.
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| 27. | Subsequent X-ray observations by the HEAO 1 and Einstein Observatory showed a complex source that included the active galactic nucleus of M87.
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| 28. | Suppose an astronaut in a modern spacesuit gets teleported to 10 Schwarzchild radii from an active galactic nucleus, inside the accretion disc.
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| 29. | The interaction between the two galaxies is triggering a burst of star formation in NGC 1614, although not apparently an active galactic nucleus.
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| 30. | The galaxy also contains a notable active galactic nucleus ( AGN ) that is a strong source of multiwavelength radiation, particularly radio waves.
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