Astronomy Picture of the Day—

The Horsehead Nebula
Image Credit & Copyright: Mark Hanson & Martin Pugh, SSRO, PROMPT, CTIO, NSF

Explanation: Sculpted by stellar winds and radiation, a magnificent interstellar dust cloud by chance has assumed this recognizable shape. Fittingly named the Horsehead Nebula, it is some 1,500 light-years distant, embedded in the vast Orion cloud complex. About five light-years "tall", the dark cloud is cataloged as Barnard 33 and is visible only because itsobscuring dust is silhouetted against the glowing red emission nebula IC 434. Stars are forming within the dark cloud. Contrasting blue reflection nebula NGC 2023, surrounding a hot, young star, is at the lower left of the full image. The featured gorgeous color image combines both narrowband and broadband images recorded using several different telescopes.

马头星云

这个可辨认形状的的壮丽星际尘埃云是在恒星风和辐射雕刻下偶然形成的。它也被称为马头星云，距离地球约1500光年，镶嵌在巨大的猎户星云复合体中。这团暗云的编录号为巴纳德33，其宽度约为5光年，它之所以可见是因为模糊的尘埃在炽热红色发射星云IC 434的衬托下呈现出的剪影。许多恒星正在暗云内形成。与之形成鲜明对比的是蓝色反射星云NGC 2023，它环绕着一颗炽热的年轻恒星，位于这幅图像的左下方。这幅绚丽的彩色特征影像是由多台不同望远镜拍摄的窄带和宽带照片组合而成。

高清原图地址：

https://apod.nasa.gov/apod/ap191217.html

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