地球离最近的恒星大约为4光年。
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。
This law is known to hold true for galaxies at a distance of at least several billion light years.
然而，Gliese 581g 距离地球20光年。
它来自射手座的方向；那个方向最近的恒星距离220光年。
It came from the direction of Sagittarius; the nearest star in that direction is 220 light-years away.
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。
From end to end, the Milky Way's starry disk, observable with the naked eye and through optical telescopes, spans 120,000 light-years.
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。
That means that our nearest neighbours are perhaps 100 light years away, which is almost next door in astronomical terms.
游乐园中有许多广受欢迎的游乐项目，如森林河流之旅及根据《玩具总动员》中太空战警命名的巴斯光年星际历险。
The park will feature popular rides like Jungle River Cruise and a Buzz Lightyear Ride, named after the spaceman warrior in the movie "Toy Story".
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。
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.
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 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.
它可以看到137亿光年以外的物体。
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 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.
相互作用的两个星系相距数万光年。
The two interacting galaxies are separated from each other by tens of thousands of light-years.
在那个距离，这张图约宽300光年。
At that distance, this image would be about 300 light-years across.
詹姆斯·索尔特：光年(1975)。
我们经过11光年的旅行达到这个星球。
烟花星系的螺旋近四万光年。
Nearly 40,000 light-years across, the nearby spiral is fittingly referred to as the Fireworks Galaxy.
水母星云约5000光年远。
它距离地球870光年远。
不过，这颗行星距离地球长达600光年。
该星团嵌在一个约110光年大的星云内。
The star cluster is embedded in a nebula, which spans some 110 light-years.
这幅壮观的景象蔓延了近50000光年。
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.
对比一下，离太阳最近的恒星也在4光年之外。
For comparison, the closest star to the Sun is over 4 light-years away.
欧特云团距太阳1光年距离。
The Oort Cloud is thought to extend about 1 light year from the Sun.
钱德拉能检测和成像数十亿光年之遥的X射线源。
Chandra detects and images X-ray sources that are billions of light years away.
图片中间的绿色环状结构的跨度大概有77光年。
The green ring structure near the center of the image is about 77 light-years across.
大麦哲伦星云的直径大约为 15000光年。
The Large Magellanic Cloud is about 15, 000 light-years across.
我们已经可以得到距离地球百万光年之外星系的照片了。
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。
Now we have images of galaxies millions of light years away from Earth.
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