Blue Lagoon
Credit & Copyright: Russell Croman
Explanation: Stars come and go as you slide your cursor over this engaging image of M8, aka the Lagoon Nebula. Of course, the nebula is itself a star-forming region, but the stars that appear and disappear here include background and foreground stars that by chance lie along the same line of sight. In this "for fun" comparison of two nearly identical digital images, the stellar point sources were removed from one image by computer processing to leave only the diffuse emission from the glowing gas clouds. In both pictures, red emission (H-alpha emission) from atomic hydrogen dominates the cosmic lagoon's visible light, but narrow band filters were used to record the image data and map the hydrogen emission to green hues, with emission from sulfur atoms in red and oxygen in blue. The lovely Lagoon Nebula spans about 30 light-years at an estimated distance of 5,000 light-years toward the constellation Sagittarius.
说明：恒星的产生和消逝就如同你在这张迷人的M8影像上滑动光标一样迅速，M8也被称为礁湖星云。当然，该星云本身也是一个恒星形成区域，但是在这里产生及消失的恒星包括了偶然间位于相同视线上的背景和前景恒星。由两张几乎同样的数字图像合成了这张有趣的图片，其中的恒星点源经过计算机处理后已从图像中移除，只留下了炽热气体云弥漫的光热。在两张图像中，来自氢原子发出的红光（H-阿尔法辐射）在礁湖星云的可见光中占据主要部分，但是，窄带滤波器被用来记录图像数据和描绘了氢元素发出绿光，同时还记录下了硫原子发出的红光，氧原子发出的蓝光。这可爱的礁湖星云的大小有30光年，位于距离我们大约5,000光年的人马座内。（翻译：陈昌）
译文来源（十万分感谢Eldghost同好找到译文！）：
http://www.bjp.org.cn/apod/2006-08/25/content_6892.htm |
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atrick He"][quote:3a047d0f73="活动星图"]不错，梦幻的色彩，层次鲜明，细节清晰，是难得的好图！很适合作为桌面，收入“桌面酷图系列”和精华区。
很不错的星云~~