两个朋友之间的星系
(原标题: The Galaxy Between Two Friends)
2021-11-06
浏览次数: 29
八月的一个晚上，两个朋友在法国阿尔卑斯山的帝国高原徒步旅行了一天后，欣赏到了这幅景色。在海拔2400米的地方，天空晴朗。在这张简单的垂直全景图中，落日的光芒照亮了前景。在我们银河系的平面上，仙后座和英仙座的恒星在全景图的左边缘闪闪发光。但是，在夜晚，仙女座星系就像一朵暗淡的云，核心更亮，就在这两个朋友的正上方。仙女座是离我们最近的大型螺旋星系，距离银河系的恒星大约250万光年。在夜晚共享的星系外视角中，天空中介于它们之间的模糊点是M33，也被称为三角座星系。三角座星系是本星系群中第三大星系，仅次于仙女座星系和银河系，距离我们大约300万光年。那天晚上，这两个朋友相距3光纳秒。
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On an August night two friends enjoyed this view after a day's hike on the Plateau d'Emparis in the French Alps. At 2400 meters altitude the sky was clear. Light from a setting moon illuminates the foreground captured in the simple vertical panorama of images. Along the plane of our Milky Way galaxy stars of Cassiopeia and Perseus shine along the panorama's left edge. But seen as a faint cloud with a brighter core, the Andromeda galaxy, stands directly above the two friends in the night. The nearest large spiral galaxy, Andromeda is about 2.5 million light-years beyond the stars of the Milky Way. Adding to the evening's shared extragalactic perspective, the fainter fuzzy spot in the sky right between them is M33, also known as the Triangulum galaxy. Third largest in the local galaxy group, after Andromeda and Milky Way, the Triangulum galaxy is about 3 million light-years distant. On that night, the two friends stood about 3 light-nanoseconds apart.
© Martin Lefranc