1.
Extragalactic nebula is invisible to the naked eye.
我们用肉眼是看不到河外星系的。
2.
M100 is a member of the huge Virgo cluster of an estimated2,500 galaxies.
M100是室女座中2500个河外星系（估计）的一个，该星系天文业余爱好者可观测。
3.
Are there other universes outside our own?
在我们的银河系之外还有别的星系吗?
4.
They showed that the Andromeda nebula lay far outside our Milky Way Galaxy.
测量表明，仙女座星云远在我们的银河系之外。
5.
Their discovery marks the first abundance determination of the actinides element thorium in a star beyond the Milky Way, and follows the detection of thorium in more than ten stars within the Milky Way.
他们发现,标志着首丰测定的锕系元素钍星以外的银河系,跟检测钍十余恒星的银河系.
6.
extragalactic compact radio source
河外致密射电源，类星体
7.
Out there beyond the Milky Way is a good-sized volume nearly devoid of noticeable galaxies.
在银河系之外相当大的空间内几乎没有明显的星系了。
8.
of or relating to a galaxy (especially our galaxy the Milky Way).
属于星系，与星系有关，尤指银河系。
9.
Of or relating to a galaxy, especially the Milky Way.
星系的，银河系的星系的，与星系有关的，尤指银河系
10.
galactic noise
【无】银河(星系射电)噪音
11.
Similarly, the appearance of the Milky Way-which is a hazy agglomeration of the light from many billions of stars-shows that our galaxy is also disklike in shape.
同样的，聚集了数十亿恒星光芒的银河系，其朦胧的外貌显示我们的星系也是圆盘状的。
12.
The supernova Ia ratio in milky way galaxy;
银河系Ⅰa型超新星所占星系恒星数目比例
13.
Clouds of stars and glowing gas, with patches of darkening dust, mark the slow-changing spiral patterns of the Galaxy disk.
点缀着暗淡尘埃的团团恒星和发光星云，标记着银河系缓慢变化的旋涡外形。
14.
The sun is one of the stars in the galaxy, in which there are about 100,000 million stars.
太阳是银河系中的一颗恒星，银河系大约有一千亿颗恒星。
15.
extrapolation type satellite's guidance system
外推法卫星制导系统
16.
to contact with people on other planets,
在和外星人联系中,
17.
In addition, observations of space around our Sun have revealed that unlike the rest of the galaxy, space near us has little interstellar gas in it.
此外,对太阳周围太空的观察还显示,与银河系的其他部分不同,我们周围的太空中星际气体很少。
18.
Normal matter and galaxy cluster is mostly in the form of hot gas and stars.
正常物质和银河系主要在热气体和星星形式中。