Credit: Jay Ballauer
Explanation: Not all roses are red of course, but they can still be very pretty. Likewise, the beautiful Rosette Nebula and other star forming regions are often shown in astronomical images with a predominately red hue - in part because the dominant emission in the nebula is from hydrogen atoms. Hydrogen's strongest optical emission line, known as H-alpha, is in the red region of the spectrum, but the beauty of an emission nebula need not be appreciated in red light alone. Other atoms in the nebula are also excited by energetic starlight and produce narrow emission lines as well. In this gorgeous view of the Rosette's central regions, narrow band images are combined to show emission from sulfur atoms in red, hydrogen in blue, and oxygen in green. In fact, the scheme of mapping these narrow atomic emission lines into broader colors is adopted in many Hubble images of stellar nurseries. This image spans about 50 light-years in the constellation Monoceros, at the 3,000 light-year estimated distance of the Rosette Nebula.
说明: 并非所有的玫瑰都是红色的，但它们同样美丽。美丽的玫瑰星云以及其它的星星形成区域，经常是利用红色来显示其存在，这是因为星云主要的发光是来自于氢原子，其特征辐射就是就是红色的，但却并不限于这个颜色。星云中其实还有其它的原子，被高能的恒星风所激发出的窄发射线。这张玫瑰星云中心内部区域的影像，就使用很多窄波的影像来显示硫原子(红色)，氢气(蓝色)，和氧气(绿色)的存在。事实上，这样以原子的发光窄线来表示颜色的方式，也是哈勃太空望远镜所经常采用的着色方法。这张影像位于麒麟座(Monoceros)，横跨约50光年，美丽的玫瑰星云距离我们约 3,000 光年。
原文来自： http://antwrp.gsfc.nasa.gov/apod/ap060324.html
译文来自：http://www.astron.sh.cn/picbase/daily/060619/060619.htm（上海网上天文台 cliff编译） |
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