Astronomy Picture of the Day——尘埃场内的鸢尾花星云

The Iris Nebula in a Field of Dust 
Image Credit & Copyright: Markus Bauer

Explanation: These cosmic dust clouds drift some 1,300 light-years away along the fertile starfields of the constellation Cepheus. The beautiful Iris Nebula, also known as NGC 7023, blossoms at the upper left. Not the only nebula in the sky to evoke the imagery of flowers, its pretty, symmetric form spans about 6 light-years. This nebula's dominant blue color is characteristic of the pervasive dust grains reflecting light from a nearby hot, bluish star. But darker, obscuring dust clouds cover most of the nearly 4 degree wide field of view. At the right is the LDN 1147/1158 complex of Lynds Dark Nebulae. Stars are forming there, still hidden within the dark cloud cores. A search through the sharp image can identify Herbig-Haro objects though, jets of shocked glowing gas emanating from recently formed stars.

尘埃场内的鸢尾花星云

图片中的宇宙尘埃云距离地球大约1,300光年，漂浮在仙王座星场内。这个被称为NGC 7023的美丽鸢尾花星云在图像左上方绽放。虽然它不是天空中唯一能让人联想到花的星云，但其对称的外形结构跨越了6光年的天区，显得格外壮丽。该星云特有的蓝色光芒是尘埃颗粒反射附近一颗炽热蓝色恒星的星光所导致的。但这个较暗的模糊尘埃云覆盖了将近4度宽视场的大部分区域。图像右侧是林茨暗星云的LDN1147/1158复杂体。恒星正在那里形成，仍然隐藏在暗星云的核心中。通过对这幅清晰图像的搜索，能够发现赫比格-哈罗天体，它是由最近形成的恒星发出的冲撞炽热气体产生的喷流。

高清原图地址：

https://apod.nasa.gov/apod/image/1909/IRISNebulaSurroundingsNGC7023.jpg

近期文章：

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