2018年01月08日:仙女座的云气-（Clouds of Andromeda）--原图下载
Image Credit & Copyright: Daniel López /IAC
说明: 仙女座大星系周围的这些泛红云气是什么？上图中的星系M31，是地球天文学家经常拍摄的标的。作为最邻近我们的大螺旋星系，它的黝黑尘埃带、明亮泛黄的核心和散布着明亮泛蓝星团的螺旋臂，都是我们很熟悉的景观。然而，在这幅由宽及窄波段长曝光影像数据组合成的彩色照片里，我们邻近的宇宙岛却带着我们并不熟悉的醒目特徵──在影像视野里，散布着会发出暗淡泛红辉光的电离氢云。不过这些电离氢气云，很确定是位在影像的前景，近在我们的银河系之内。在我们银河盘面上方数百光年处，分布着弥漫的星际尘埃卷云，而这些电离气体可能就和它有关联。
原文：
Image Credit & Copyright: Daniel López /IAC
Explanation: What are those red clouds surrounding the Andromeda galaxy?This galaxy, M31, is often imaged by planet Earth-based astronomers.As the nearest large spiral galaxy, it is a familiar sightwith dark dust lanes, bright yellowish core, andspiral arms traced by clouds of bright blue stars. A mosaic of well-exposed broad and narrow-band image data, this colorful portrait of ourneighboring island universeoffers strikingly unfamiliarfeatures though, faint reddish clouds of glowingionized hydrogen gas in the same wide field of view.These ionized hydrogen clouds surelylie in the foreground of the scene, well within our Milky Way Galaxy.They are likely associated with the pervasive, dustyinterstellar cirrusclouds scattered hundreds of light-years above our own galactic plane.
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