Astronomy Picture of the Day——蜘蛛星云的红外影像

The Spider Nebula in Infrared 
Image Credit: NASA, JPL-Caltech, Spitzer Space Telescope, 2MASS

Explanation: Will the spider ever catch the fly? Not if both are large emission nebulas toward the constellation of the Charioteer (Auriga). The spider-shaped gas cloud on the left is actually an emission nebula labelled IC 417, while the smaller fly-shaped cloud on the right is dubbed NGC 1931 and is both an emission nebula and a reflection nebula. About 10,000 light-years distant, both nebulas harbor young, open star clusters. For scale, the more compact NGC 1931 (Fly) is about 10 light-years across. The featured picture in scientifically-assigned, infrared colors combines images from the Spitzer Space Telescope and the Two Micron All Sky Survey (2MASS). Spitzer is celebrating its 16th year orbiting the Sun near the Earth.

蜘蛛星云的红外影像

这只蜘蛛会抓住那只苍蝇吗？它们都是位于御夫座方向的大型发射星云。图像左侧好似蜘蛛的气体云实际上是编号为IC 417的发射星云，而右侧较小的形似苍蝇的气体云是NGC 1931，它既是发射星云，也是反射星云。这两个星云距离地球约1万光年，拥有很多年轻的疏散星团。致密的苍蝇星云NGC 1931跨度约为10光年。这幅经过染色的红外图像是由斯皮策太空望远镜和2微米巡天计划望远镜拍摄的照片组合而成的。斯皮策太空望远镜正在庆祝其伴随地球绕太阳运行的第16年。

高清原图地址：

https://apod.nasa.gov/apod/image/1909/SpiderFly_Spitzer2Mass_4165.jpg

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