M16, The Eagle Nebula
M16，猎户座星云
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The image shows a section of the Eagle Nebula which surrounds star cluster M16 (also designated NGC6611). It is in the constellation Serpens at about 6500 light years (2000 parsecs) from Earth. It is classified as an emission nebula. It consists predominantly of ionized hydrogen and is referred to as an H II region because of the emission spectrum of ionized hydrogen. The collection of hot, bright O and B stars at its center provide the ultraviolet ionizing radiation which causes the hydrogen to be luminous. 图像显示了鹰星云的一部分，该星云围绕着星团M16（也称为NGC6611）。它位于蛇夫座，距离地球约6500光年（2000秒差距）。它被归类为发射星云。它主要由电离氢组成，并因其电离氢的发射光谱而被称为H II区域。其中心的高温、明亮的O型和B型恒星提供了紫外波段的电离辐射，导致氢变得发光。
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Star concepts
Reference
Kaufmann
Ch. 2
索引 星体概念 参考文献 Kaufmann 第2章
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