From end to end, the Milky Way's starry disk, observable with the naked eye and through optical telescopes, spans 120,000 light-years.
从一端到另一端，银河系布满星星的圆盘横跨12万光年，可以用肉眼和光学望远镜观察到。
It came from the direction of Sagittarius; the nearest star in that direction is 220 light-years away.
它来自射手座的方向；那个方向最近的恒星距离220光年。
It would seem sensible to seek the source of these in the universe's most conspicuous energy factories: quasars and gamma-ray bursts billions of light-years away from Earth.
在宇宙中最引人注目的能量工厂——距离地球数十亿光年的类星体和伽马射线爆发——中寻找这些物质的来源似乎是明智的。
It is 870 light-years from Earth.
它距离地球870光年远。
The pair are about 31 million light-years distant.
这一对星系相距大约3千1百万光年。
MACS 1206 lies 4.5 billion light-years from Earth.
1206号卫星距地球有45亿光年远。
The magnificent vista spans nearly 50, 000 light-years.
这幅壮观的景象蔓延了近50000光年。
Gliese 581 is a red dwarf star 20.5 light-years from Earth.
格利泽581是一颗红矮星距离地球20.5光年。
Of course, the cosmic elephant's trunk is over 20 light-years long.
当然，这个星际象鼻长达 20光年以上。
At that distance, this image would be about 300 light-years across.
在那个距离，这张图约宽300光年。
For comparison, the closest star to the Sun is over 4 light-years away.
对比一下，离太阳最近的恒星也在4光年之外。
The star cluster is embedded in a nebula, which spans some 110 light-years.
该星团嵌在一个约110光年大的星云内。
At the estimated distance of NGC 6188, the picture spans about 200 light-years.
以NGC 6188的距离推测，这张图片宽约200光年。
In fact, two of the 56 stars within 15 light-years are already known to have planets.
实际上，在15光年内的56颗恒星中有两颗已经确知带有行星了。
The green ring structure near the center of the image is about 77 light-years across.
图片中间的绿色环状结构的跨度大概有77光年。
Indeed, something similar may have happened in a solar system just 50 light-years away.
的确，就在50光年之外的一个恒星系统中，可能发生过类似的情况。
They used it to detect methane in the atmosphere of a planet nearly 63 light-years away.
利用这项技术，他们测出距地球约63光年的一颗行星大气中含有甲烷。
Vela A is about 3, 300 light-years away. This image spans about 130 light-years in space.
船帆A距地球3300光年，照片中的空间跨度约有130光年。
Each outfit was dosed with just the right kind of reality, while still seeming light-years ahead.
每件套装的所融合的现实感刚刚好，但看起来却象是领先了好几个光年。
Located 54 light-years away, the exoplanet is yet another member of the super-Earth club [source: NASA].
这颗系外行星位于54光年以外，是“超级地球俱乐部”的又一个成员[来源: NASA]。
The field covers over 500 thousand light-years at the trio's estimated distance of 30 million light-years.
这张画面的视场覆盖大约为50万光年，三重星系估计距离为3000万光年远。
Also known as the Andromeda Galaxy, M31 is more than 220,000 light-years across and lies 2.5 million light-years away.
M31星系也被称为仙女座星系，它跨越了220 000光年，距我们2百50万光年。
Explanation: Staring across interstellar space, the alluring Cat's Eye nebula lies three thousand light-years from Earth.
解说：透过星际望远镜可以看到距离地球三千光年的迷人的猫眼星云。
The nearest star to earth is about 4 light years away.
地球离最近的恒星大约为4光年。
This law is known to hold true for galaxies at a distance of at least several billion light years.
这个定律被普遍认为同样适用于至少数十亿光年之远的星系。
Full employment still seems light years away.
充分就业好像依然是遥遥无期。
She says the French education system is light years ahead of the English one.
她说法国的教育体制远比英国的先进。
However, Gliese 581g is twenty light years from the Earth.
然而，Gliese 581g 距离地球20光年。
However, Gliese 581g is twenty light years from the Earth.
然而，Gliese 581g 距离地球20光年。
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