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。
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。
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。
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。
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。
M101 was also one of the original spiral nebulae observed by Lord Rosse's large 19th century telescope, the Leviathan of Parsontown.
M101还是罗斯爵士用19世纪的大型望远镜，“帕森镇的巨兽”，所发现的最早的螺旋星云之一。
An image released by NASA shows the Heart and Soul nebulae in an infrared Mosaic from the Wide-field infrared Survey Explorer, or WISE.
美国宇航局发表的这个图像显示了广视野红外勘测探测器WISE拍摄的心与灵星云(Heart and Soul)红外马赛克。
Where the otherwise obscuring dust clouds lie close to the hot, young stars they also reflect starlight, forming blue reflection nebulae.
那些靠近年轻热恒星的遮蔽尘埃云也反射恒星光，形成蓝色的反射星云。
L Glowing nebulae are named because they give off a dim, red light, as the hydrogen gas in them is heated by radiation from nearby stars.
l有一种星云叫亮星云，它们发出暗淡的红光，这种红光是因为构成星云的氢气受到附近星体的射线激发而发出的光线。
Although he did not know it at the time, this was the first in a class of objects, now known as planetary nebulae, to make it into the catalog.
尽管他当时并不知道，这是首个被记录在册的行星状星云。
Both nebulae are remarkably symmetric, round, and similar in size, some 2 light-years across or about 2, 000 times the diameter of Neptune's orbit.
两个星云均圆形、对称，而且大小相仿，直径约2光年或约为海王星轨道的2000倍。
The universe is an unimaginably vast space filled with planets, stars, systems, nebulae, gas, dust — and it's impossible for us to ever explore it all.
宇宙的浩瀚无涯超出想象，无数的恒星、行星、星系、星云、气体、尘埃充斥其间，让我们无法一一探遍每一个角落。
Astronomical images of the well-known Pleiades often show the cluster's alluring blue reflection nebulae, but they are washed-out here in the bright moonlight.
著名的昴星团在天文照片中常常以迷人的蓝色反射星云夺人眼目，但在这张照片上，它们因明亮的月光而失色。
Astronomical images of the well-known Pleiades often show the cluster's alluring blue reflection nebulae, but they are washed-out here in the bright moonlight.
著名的昴星团在天文照片中常常以迷人的蓝色反射星云夺人眼目，但在这张照片上，它们因明亮的月光而失色。
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