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。
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。
But a bunch of strong extragalactic microwave - and radio-sources are out there too, mucking up our picture!
而且有一群强大的银河系外微波和无线电源，弄脏了我们的图片！
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。
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。
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。
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。
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