L Reflection nebulae have no light of their own.
l还有一种星云叫反射星云，它们本身并不发光。
The Nebulae is based on chips from Intel and Nvidia.
现在的曙光星云是利用英特尔和Nvidia的芯片建立的。
Nowadays, many nebulae are known to be galaxies instead.
我们现在已经熟知的许多星系过去也被称为星云。
These nebulae can be seen with binoculars from a dark location.
你可以在较暗的地区用双筒望远镜看到这两个星云。
L the Ring nebula in Lyra is the best-known of the planetary nebulae.
l天琴座中的环状星云是最著名的行星状星云。
Planetary nebulae fade away gradually over tens of thousands of years.
行星状星云在数万年间逐渐衰老。
Stars that form planetary nebulae typically live for billions of years.
具有代表性的是，构成行星状星云的恒星已经存活了十亿年。
Hot stars embedded in the dust can be seen as bluish reflection nebulae.
热恒星嵌在尘埃中即表现为蓝色的反射星云。
Brightclusters and nebulae abound in the northern constellation of Auriga.
御夫座北部有大量明亮的星团和星云。
L Dark nebulae not only have no light of their won, they also soak up all light.
l暗星云不仅本身不发光，而且会吸收所有的光线。
Light is unable to escape through a number of dark nebulae which are present there.
光线是无法逃出那里存在的大量暗色星云的。
This dark tower, NGC 6231, and associated nebulae are about 5, 000 light-years away.
这座暗黑之塔NGC 6231和与之相连的星云距我们大约 5000 光年远。
NGC 2818 is one of very few planetary nebulae in our galaxy located within an open cluster.
NGC2818是银河系中少数几个位于疏散星团内部的行星状星云之一。
The expansive Seagull (upper left) is itself composed of two major cataloged emission nebulae.
广阔的“海鸥”(左上)本身由两个较大的被编目的发射星云组成。
Separated by a dark cloud of obscuring dust, the two bright nebulae are about 1,500 light-years away.
这两个明亮的星云相距1500光年，中间隔着一片模糊尘埃的暗云。
Hanging from his belt, the stars and nebulae of the Hunter's sword are visible lower and to the right.
我们可以看到代表猎人的腰带上吊着的宝剑的恒星和星云在右下方。
Separated by a dark cloud of obscuring dust, the two bright nebulae are about 1, 500 light-years away.
这两个明亮的星云相距 1500 光年，中间隔着一片模糊尘埃的暗云。
These nebulae, which are not technically related to planets, are gas clouds forced outward by a dying star.
行星状星云实际上是一些即将消亡的恒星抛射出的气体外壳，在学术上与行星并没有什么关系。
Basic organic (life) chemicals such as amino acids have been detected in nebulae and meteorites (see meteors).
构成生命组织的基本化学物如氨基酸，在星云和陨石中也被发现。
The signature images from Hubble, which turns 20 in April, show careering galaxies, exploding stars, eerie nebulae.
到4月，哈勃就年满20岁了。它传回的特色照片展示了极速运行中的星系、爆炸的恒星以及怪异的星云。
Nebulae are perhaps as famous for being identified with familiar shapes as perhaps cats are for getting into trouble.
星云也许以熟悉的形状被认出而著名，例如形状象那些卷入麻烦的猫。
But the deep exposure also brings out the reddish emission nebulae of star-forming regions IC 405, IC 410, and IC 417.
而长时间曝光也拍出了红色发射星云、恒星形成区ic 405、IC 410和IC 417。
The sharp Hubble data also reveal more distant background galaxies seen right through NGC 2442's star clusters and nebulae.
敏锐的哈勃数据还暴露了更多遥远的背景星系，右边透过NGC 2442的星团和星云可见。
In 1995, astronomers used the Hubble Space Telescope to make a series of images of planetary nebulae, including the one above.
在1995年，天文学家用哈勃太空望远镜捕捉到一系列的行星状星云图像，其中包括上面这幅图像。
How planetary nebulae can form such complex structures, however, is a hot debate among professional astronomers such as Jacoby.
然而，关于行星星云如何形成这么复杂的结构，却在Jacoby等专业天文学家中引发了一场热烈的争论。
The name originates from the 18th century, when telescopes weren't powerful enough to distinguish nebulae from gas giant planets.
这个名字源于18世纪，当时望远镜威力还不够强大，无法区分星云和气态巨行星。
Astronomers used the Hubble Space Telescope to make a series of images of planetary nebulae in the mid-1990s, including this one.
上世纪九十年代中期，天文学家们运用哈勃太空望远镜拍摄到了这一星云的众多图像，其中便包括了这一张。
Astronomers used the Hubble Space Telescope to make a series of images of planetary nebulae in the mid-1990s, including this one.
上世纪九十年代中期，天文学家们运用哈勃太空望远镜拍摄到了这一星云的众多图像，其中便包括了这一张。
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