2021年01月13日:极区天空的拱形光弧-(Arches Across an Arctic Sky)

2021年01月13日:极区天空的拱形光弧-(Arches Across an Arctic Sky)

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2021-01-13 / 0 评论 / 0 阅读 / 正在检测是否收录...

2021年01月13日:极区天空的拱形光弧-(Arches Across an Arctic Sky)
[2021年01月13日:极区天空的拱形光弧-(Arches Across an Arctic Sky)--原图下载](https://apod.nasa.gov/apod/image/2101/ArcticSky_Cobianchi_2048.jpg"
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Image Credit & Copyright: Giulio Cobianchi
说明: 天空中这二道庞大的拱形光弧是什么?左侧是我们较熟悉的银河系中央盘面,它是由众多恒星和星云汇集而成,看似环绕整个南天的盘状结构。银河拱的下方,则有鏽红火星和弥漫的仙女座大星系。在这个酷寒的极区夜晚短短的数分钟期间,另一道由极光聚成几乎环拱整个北天的拱形光弧,出现在影像右侧。地球高层大气中的极光,显然远比恒星要近。在泛绿的极光弧上方,可见到名为 北斗七星的一群恒星。这幅主题影像,组合自12月中旬摄于挪威罗弗敦群岛的18张照片。

原文:

Image Credit & Copyright: Giulio Cobianchi
Explanation: What are these two giant arches across the sky?Perhaps the more familiar one, on the left, is the central band of our Milky Way Galaxy.This grand disk of stars and nebulas here appears to encircle much of the southern sky.Visible below the stellar arch is the rusty-orange planet Mars and the extended Andromeda galaxy.For a few minutes during this coldarctic night, a second giant arch appeared to the right, encircling part of the northern sky: an aurora.Auroras are much closer than stars as they are composed of glowing air high in Earth's atmosphere. Visible outside the green auroral arch is the group of stars popularly known as the Big Dipper. The featured digital composite of 18 images was captured in mid-December over the Lofoten Islands in Norway.

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