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。
It can see objects about 13.7 billion light years away.
它可以看到137亿光年以外的物体。
However, Gliese 581g is twenty light years from the Earth.
然而，Gliese 581g 距离地球20光年。
That means that our nearest neighbours are perhaps 100 light years away, which is almost next door in astronomical terms.
那意味着我们最近的邻居星球离我们大约有100光年远，从天文学的角度来说，这几乎是一墙之隔。
The first is a pair of planets, each about the mass of Jupiter, that whirl around their home star 15 light years from Earth in perfect lockstep.
第一个是一对质量与木星差不多的行星，这对行星步调一致地围绕距离地球15光年的母恒星旋转。
The stars being searched are hundreds of light years away, so it takes hundreds of years for their signal to reach us, and a further few hundred years for our reply to reach them.
被搜寻的星星离我们有几百光年远，所以它们的信号传到我们这里需要几百年，而我们的答复传到它们那里又需要几百年。
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。
James Salter: Light Years (1975).
詹姆斯·索尔特：光年(1975)。
It is, however, 600 light years from Earth.
不过，这颗行星距离地球长达600光年。
We have journeyed 11 light years to reach this planet.
我们经过11光年的旅行达到这个星球。
Now we have images of galaxies millions of light years away from Earth.
我们已经可以得到距离地球百万光年之外星系的照片了。
It is about 220, 000 light years in diameter to the Milky Way's 100, 000.
它的直径约220,000光年，而银河系直径距离为100,000光年。
Chandra detects and images X-ray sources that are billions of light years away.
钱德拉能检测和成像数十亿光年之遥的X射线源。
Nuclear energy is the cleanest, most efficient energy we have - by light years.
核能是迄今为止我们拥有的最洁净、最高效的能源——以光年计算(不太明白)。
The water vapor is spread around the black hole in a gaseous region spanning hundreds of light years.
黑洞的周围则围绕着大量水蒸汽，被水蒸汽覆盖区域的幅度达到了数百光年。
The clusters are over 7, 000 light years distant toward the constellation of Perseus, but are separated by only hundreds of light years.
该星群距离英仙座超过7000光年，不过两星之间的距离不过数百光年。
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。
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。
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。
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 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。
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。
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。
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