朝向仙女座的深空
(原标题: The Deep Sky Toward Andromeda)
2021-09-08
浏览次数: 33
仙女座星系周围是什么？在太空中，仙女座星系（M31）被几个小卫星星系紧密包围，更远的地方它是本星系群的一部分——我们的银河系也是本星系群的一员。然而，在天空中，我们银河系的气体云似乎围绕着M31，这与地球大气中的水云可能围绕着我们的月球没什么不同。然而，朝向仙女座的气体云通常太暗而看不见。这张特色的45度长图是迄今为止拍摄的更广阔的仙女座区域的深度图像之一。这张图像对氢气发出的光线非常敏感，它以惊人的细节展示了这些模糊而不熟悉的云。但这张照片捕捉到了更多信息。在图像的顶部是三角座星系（M33），它是本星系群中第三大的星系，也是肉眼可以看到的最远的天体。M33下方是明亮的银河系恒星Mirach。该图像是2018年至2021年在德国普尔斯尼茨拍摄的几次长时间曝光的数字积累。
查看原文解释
What surrounds the Andromeda galaxy? Out in space, Andromeda (M31) is closely surrounded by several small satellite galaxies, and further out it is part of the Local Group of Galaxies -- of which our Milky Way galaxy is also a member. On the sky, however, gas clouds local to our Milky Way appear to surround M31 -- not unlike how water clouds in Earth's atmosphere may appear to encompass our Moon. The gas clouds toward Andromeda, however, are usually too faint to see. Enter the featured 45-degree long image -- one of the deeper images yet taken of the broader Andromeda region. This image, sensitive to light specifically emitted by hydrogen gas, shows these faint and unfamiliar clouds in tremendous detail. But the image captures more. At the image top is the Triangulum galaxy (M33), the third largest galaxy in the Local Group and the furthest object that can be seen with the unaided eye. Below M33 is the bright Milky-Way star Mirach. The image is the digital accumulation of several long exposures taken from 2018 to 2021 from Pulsnitz, Germany.