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- line emission nebula 谱线发射星云
- When a proton recaptures an electron, red light is frequently emitted, as seen in the surrounding emission nebula. 当质子再和电子复合时，经常会发出红光，形成大片的发射星云。
- The emission nebula's red color is caused by electrons recombining with protons to form hydrogen atoms. 发射星云显现的红色是由质子再次与电子结合形成氢原子后形成。
- Although glowing like an emission nebula, the origin of the bubble, known as Barnard's Loop, is currently unknown. 尽管它像发射星云一样炽热，被称为巴纳德环的泡泡，其起源现在还未知。
- The bland New General Catalog designation of NGC2237 doesn't appear to diminish the appearance of the this flowery emission nebula. 在新总表中所命名的NGC2237，看来并没有减损这个花似的发射星云之外观。
- Also called 30 Doradus, the red and pink gas indicates a massive emission nebula, although supernova remnants and dark nebula also exist there. 该星云还被称为剑鱼座30，红色和粉色气体代表了大质量发射星云，尽管那里还存在着超新星和黑暗星云。
- The greater Eagle emission nebula, tagged M16, lies about 6500 light years away, spans about 20 light-years, and is visible with binoculars toward the constellation of Serpens. 老鹰星云及其周围的发射星云合称为M16，大小约为20光年，距离我们约有6500光年远，用双筒望远镜可在北天的巨蛇座内找到它。
- In order to diagnose the polarization of the x-ray line emission of plasmas excited by Z-pinch, a X-ray line polarization spectrometer is developed for measuring the spectrums. 摘要针对Z箍缩等离子体辐射的X射线光谱极化信息，研制了适用于Z箍缩装置的X射线晶体谱仪。
- Other types of nebulas visible here include red emission nebula and the blue reflection nebula. 在这里还能看到其它星云，包括红色的发射星云和蓝色的反射星云。
- Like other stellar nurseries, the Cocoon Nebula holds, at the same time, a bright red emission nebula, blue reflection nebulas, and dark absorption nebulas. 就像其它恒星孕育场一样，茧状星云同时具有明亮的红色发射星云，蓝色的反射星云以及黑暗的吸收星云的角色。
- The Trifid, also known as M20, is only about 300,000 years old, making it among the youngest emission nebulae known. 三裂星云也被称为M20，年龄只有30万年，这让它成为迄今为止最年轻的发射星云。
- Possibly not, but that is where two bright emission nebulas nicknamed Heart and Soul can be found. 可能不是，但暱称为心藏与魂魄星云的明亮发射星云倒都在仙后座内。
- Numerous red emission nebulas and blue reflection nebulas are visible throughout the image. 在整张影像中，许多红色发射星云和蓝色反射星云清晰可见。
- Most emission nebulae are about 90% hydrogen, with the remainder helium, oxygen, nitrogen, and other elements. 大部分的发射星云都有90%25的氢，其馀的部份则是氦、氧、氮和其他的元素。
- Just as large star forming regions create emission nebulae in the LMC, NGC 55 is also seen to be producing new stars. 大麦哲伦星系的大面积恒星诞生区产生发射星云，NGC 55同样有新的恒星。
- Emission nebulae often have dark spots in them which result from clouds of dust which block the light. 发射星云经常会有黑斑出现，这是云气中的尘埃阻挡了光线造成的。
- Explanation: Gorgeous spiral galaxy M33 seems to have more than its fair share of bright emission nebulae. 说明：美丽的螺旋星系M33中的星云明亮程度很平均。
- The vertical line meets the horizontal one here. 垂直线与水平线在此相交。
- Of course, this star-forming region is entry number 171 in the famous 1959 catalog of emission nebulae compiled by astronomer Stewart Sharpless. 当然，在天文学家斯图尔特夏普莱斯编纂的著名的1959喷发星云目录中，这个恒星形成区域被列为序号171。
- One line cuts another at right angles. 一条线与另一条线成直角相交。
