Astronomer Art Hoag first asked this question when he chanced upon this unusual extragalactic object.
当天文学家阿特·霍格偶然发现这个银河系外的非同一般的物体时，他首先问出来这个问题。
An exoplanet has been discovered orbiting a star of extragalactic origin that contains far less metal than models predict for stars with planets. Christopher Intagliata reports.
天文学家发现一颗系外行星，它的主恒星起源于银河系外，而且此恒星的金属含量明显少于模型预期中的同类主恒星。
In this paper, we investigate the relation between the redshift distribution and the luminosity function of extragalactic objects.
在本文中，我们研究河外天体的红移分布和它们的光度函数之间的关系。
Extragalactic nebula is invisible to the naked eye.
我们用肉眼是看不到河外星系的。
"Extragalactic nebula" is a former name for "galaxy".
“外星云”是“星系”的曾用名。
This galaxy was observed by a team affiliated with the HST Key Project on the Extragalactic Distance Scale.
星系ngc 4603由隶属于哈勃太空望远镜重大项目组的“河外星系量天尺工程”团队观测。
This galaxy was observed by a team affiliated with the HST Key Project on the Extragalactic Distance Scale.
星系ngc 4603由隶属于哈勃太空望远镜重大项目组的“河外星系量天尺工程”团队观测。
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