extragalactic astronomy.
河外天文学
extragalactic radio astronomy
河外射电天文
We shall hardly even touch the captivating problems of modern extragalactic astronomy.
甚至几乎不涉及现代河外天文学中吸引人得课题。
extragalactic background radiation
河外背景辐射
The kinematic effect in the classical domains and the red shift phenomena of extragalactic objects
典型时空中的运动效应和宇观红移现象
extragalactic compact radio sources
河外致密射电源
extragalactic cosmic rays.
河外宇宙线
extragalactic cosmic ray source
河外宇宙线源
double extragalactic radio source
河外射电双源
Extragalactic double radio sources and multiple radio sources
河外射电双源和多重源
extragalactic extended radio sources
河外射电展源
Extragalactic nebula is invisible to the naked eye.
我们用肉眼是看不到河外星系的。
extragalactic supernova.
河外超新星
extragalactic radio source.
河外射电源
extragalactic light
银河外传来的光
a number of supernovae and one nova in extragalactic systems.
河外星系中发现了一批超新星和一个新星
Present Situation on Determinations of Stellar Proper Motions with Respect to Extragalactic System
以河外星系为参考系的恒星自行测定现状
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