| 单词 | galactic nucleus |
| 释义 | galactic nucleusThe 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. Words nearby galactic nucleusgalactic halo, galactic latitude, galactic longitude, galactic nebula, galactic noise, galactic nucleus, Galactico, galactic plane, galactic pole, galactic poles, galactic year The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved. |
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