本帖最后由 zheng123 于 2008-12-27 14:23 编辑
The Elephant's Trunk in IC 1396
Credit & Copyright: Gordon Haynes Explanation: (xxxedit and linkxxx) Like an illustration in a galactic Just So Story, the Elephant's Trunk Nebula winds through the emission nebula and young star cluster complex IC 1396, in the high and far off constellation of Cepheus. Of course, this cosmic elephant's trunk is over 20 light-years long. This false-color composite was recorded through narrow band filters that transmit the light from hydrogen (in green), sulfur (in red), and oxygen (in blue) atoms in the region. The resulting image highlights the bright swept-back ridges that outline pockets of cool interstellar dust and gas. Such embedded, dark, tendril-shaped clouds contain the raw material for star formation and hide protostars within the obscuring cosmic dust. Nearly 3,000 light-years distant, the relatively faint IC 1396 complex covers a large region on the sky, spanning over 5 degrees. This dramatic close-up covers a 2 degree wide field, about the size of 4 Full Moons.
来源：http://antwrp.gsfc.nasa.gov/apod/ap081226.html
翻译:说明:就像是星系里诗篇般的童话故事( 就是如此故事, Just So Story )，位于仙王座的complex IC 1396 ，从大象鼻星云的发射星云以及年轻的星团( complex IC 1396 )吹出的恒星风。当然，这个象鼻的长度超过20光年。这张照片是假色所构成的， 窄波段滤镜是包含氢、硫以及氧原子发出的谱线，分别以绿、红以及蓝色显示。产生的图片让黑暗的条纹特别明显，这是由星际间冷的尘埃及气体所组成。 这种卷曲状的云气里包含新星形成以及刚形成的恒星 。距离我们将近3000 光年远 ，相对暗的IC 1396 complex占了天空约为五度，这张照片宽约两度， 大小约是月亮的四倍。 |
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