| 单词 | active galactic nucleus |
| 释义 | > as lemmasactive galactic nucleus active galactic nucleus n. Astronomy a compact region at the centre of a galaxy which emits an abnormally large amount of radiation in one or more parts of the electromagnetic spectrum.Such regions are usually hypothesized to contain supermassive black holes. ΚΠ 1965 Astrophysical Jrnl. 142 1086 Violent phenomena such as novae, supernovae, active galactic nuclei, formation of hot stars, turbulence, etc., excite waves (hydromagnetic) in the interstellar medium. 1992 S. P. Maran Astron. & Astrophysics Encycl. 3/1 The term active galactic nuclei (or AGN) is commonly used to mean all active galaxies, including GSOs. 2008 Nature 24 Apr. p. vii Blazars are the most extreme active galactic nuclei, possessing oppositely directed plasma jets emanating from accreting supermassive black-holes at near-light speeds. < as lemmas |
| 随便看 |
|
英语词典包含1132095条英英释义在线翻译词条，基本涵盖了全部常用单词的英英翻译及用法，是英语学习的有利工具。