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2021-01-13
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"onMouseOver="if (document.images)document.imagename1.src='image/2101/ArcticSky_Cobianchi_1080_annotated.jpg';"onMouseOut="if (document.images)document.imagename1.src='image/2101/ArcticSky_Cobianchi_1080.jpg';){mtitle title="极区天空的拱形光弧"/}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,则有鏽红的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。{lamp/}原文:{mtitle title="Arches Across an Arctic Sky"/}Image Credit & Copyright: Giulio CobianchiExplanation: 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.
2021年01月13日
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2011-03-26
2011年03月26日:金牛座T星和Hind变光星云-(T Tauri and Hind's Variable Nebula)
2011年03月26日:金牛座T星和Hind变光星云-(T Tauri and Hind's Variable Nebula)--原图下载{mtitle title="金牛座T星和Hind变光星云"/}Image Credit &Copyright: Adam Block,Mt. Lemmon SkyCenter,U. Arizona说明: 这幅精彩望远镜影像中央的橘红色恒星是金牛座T星,它是T型变星 (T Tauri stars)的原型星。它附近的黄色宇宙尘埃云,名为Hind变光星云 (Hind's Variable Nebula; NGC 1555)。这两个天体离我们约有四百光年远,且位在一个分子云团的边缘。它们的观测亮度都有大幅度的变化,不过不一定会同步,而这也是此区域的待解的谜团之一。T型变星通常是年龄不到数百万年的年轻类太阳恒星,还处在恒星形成的初期阶段。红外光波段的观测使问题更加複杂难解,因为观测结果显示,金牛座T星是一个多合星系统的成员,因此它附近Hind变光星云,内部可能也藏有一个非常年轻的星体。依金牛座T星的距离来估算,这幅自然色彩影像大约涵盖了四光年的区域。{lamp/}原文:{mtitle title="T Tauri and Hind's Variable Nebula"/}Image Credit &Copyright: Adam Block,Mt. Lemmon SkyCenter,U. ArizonaExplanation: The yellowish star near center in this remarkabletelescopic skyviewis T Tauri, prototype of the class ofT Tauri variable stars.Nearby it is a dusty yellow cosmic cloudhistoricallyknown as Hind's Variable Nebula (NGC 1555).Over 400 light-years away, at the edge of a molecular cloud,both star and nebulaare seen to vary significantly inbrightness but not necessarily at the same time,adding to the mystery of the intriguing region.T Tauri stars are now generally recognized as young(less than a few million years old),sun-like stars still in theearly stages offormation.To furthercomplicate the picture, infrared observations indicatethat T Tauri itself is part of a multiple system andsuggest that the associatedHind'sNebula may also contain a very young stellar object.The naturally colored image spans about 4 light-years at the estimateddistanceof T Tauri.
2011年03月26日
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2007-12-13
2007年12月13日:金牛座T星和海德变光星云-(T Tauri and Hind's Variable Nebula)
2007年12月13日:金牛座T星和海德变光星云-(T Tauri and Hind's Variable Nebula)--原图下载{mtitle title="金牛座T星和海德变光星云"/}Credit &Copyright: Don Goldman说明: 这幅出色望远镜影像中央的橘红色恒星是金牛座T星,也是T型变星 (T Tauri stars)的原型星。它附近的黄色宇宙尘埃云,名为海德变光星云 (NGC 1555/1554)。这两个天体离我们约有四百光年远,且位在一个分子云团的边缘。它们的观测亮度会有大幅度的变化,不过不一定会同步,而这也是此区域的谜团之一。T型变星通常是年龄不到数百万年的年轻类太阳恒星,还处在恒星形成的初期阶段。红外光波段的观测更雪上加霜地让问题更加複杂难解,因为结果显示金牛座T星是一个多合星系统的成员,而和它相关的海德变光星云本身可能也藏有一个非常年轻的星体。这幅生动的彩色影像,在金牛座T星所在的距离大约涵盖了四光年之区域。{lamp/}原文:{mtitle title="T Tauri and Hind's Variable Nebula"/}Credit &Copyright: Don GoldmanExplanation: The orange star centered in this remarkabletelescopic skyviewis T Tauri, prototype of the class ofT Taurivariable stars.Nearby it is a dusty yellow cosmic cloudhistorically knownas Hind's Variable Nebula (NGC 1555/1554).Over 400 light-years away, at the edge of a molecular cloud,both star and nebulaare seen to vary significantly inbrightness but not necessarily at the same time, adding to the mystery ofthe intriguing region.T Tauri stars are now generally recognized as young(less than a few million years old),sun-like stars still in theearly stages offormation.To furthercomplicate the picture, infrared observations indicatethat T Tauri itself is part of a multiple system andsuggest that the associatedHind'sNebula may also contain a very young stellar object.The dramatic color image spans about 4 light-years at the estimateddistanceof T Tauri.
2007年12月13日
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