Galactic nucleus

galactic nucleus
The center of a galaxy, usually small, very bright, and containing a high density of stars and other objects. ◇ An active galactic nucleus is a nucleus that emits more radiation than can be explained in terms of stars alone. Blazars and quasars are thought to be active galactic nuclei; the nuclei of Seyfert galaxies are also active, and are thought to contain an extremely massive black hole.


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    noun, Astronomy. 1. the plane of the galactic equator. noun 1. the plane passing through the spiral arms of the Galaxy

  • Galactic-pole

    noun, Astronomy. 1. either of the two opposite points on the celestial sphere that are farthest north and south of the Milky Way.

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    noun, Astronomy. 1. the duration of a complete rotation of the Milky Way, approximately 200 million years.

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