Astronomy Picture of the Day——林茨暗星云1251
Lynds Dark Nebula 1251
Image Credit & Copyright: FrancescoSferlazza, Franco Sgueglia, Astro Brallo
Explanation: Stars are forming in LyndsDark Nebula (LDN) 1251. About 1,000 light-years away and drifting above theplane of our Milky Way galaxy, the dusty molecular cloud is part of a complexof dark nebulae mapped toward the Cepheus flare region. Across the spectrum,astronomical explorations of the obscuring interstellar clouds reveal energeticshocks and outflows associated with newborn stars, including the telltalereddish glow from scattered Herbig-Haro objects seen in this sharp image.Distant background galaxies also lurk on the scene, visually buried behind thedusty expanse. The deep telescopic field of view imaged with broadband filtersspans about two full moons on the sky, or 17 light-years at the estimateddistance of LDN 1251.
林茨暗星云1251
许多恒星正在林茨暗星云（LDN）1251内形成。这片尘埃分子云漂浮在银河系的盘面上，距离地球约1千光年，是仙王座爆发区方向的复杂暗星云的一部分。对模糊星云进行的天文探索发现与新生恒星有关的高能冲击波和向外流出物，包括散布在这幅清晰影像中的赫比格-哈罗天体发出的红色辉光。遥远的背景中也隐藏着众多星系，从视觉上看，它们被广阔的尘埃云所遮挡。以LDN 1251的估计距离来计算，这幅用宽带滤波器拍摄的深空望远镜影像覆盖了约两个满月或17光年的天区。
参考文献：
https://apod.nasa.gov/apod/image/1905/ldn1251.jpg
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Astronomy Picture of the Day——哈勃望远镜拍摄的斯蒂芬五重星系