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2021年09月08日:仙女大星系方向的深空影像-(The Deep Sky Toward Andromeda)
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2017年11月29日:M42:猎户座大星云-(M42: The Great Orion Nebula)
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欢迎来到人生天地间
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2017年08月06日:银河与炸裂的流星-(Milky Way and Exploding Meteor)
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2024年02月11日:直指月亮的火箭烟尘影子-(Rocket Plume Shadow Points to the Moon)
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2022-01-12
2022年01月12日:摄于澳洲的李奥纳德彗星特写-(Comet Leonard Closeup from Australia)
2022年01月12日:摄于澳洲的李奥纳德彗星特写-(Comet Leonard Closeup from Australia)--原图下载{mtitle title="摄于澳洲的李奥纳德彗星特写"/}Image Credit & Copyright: Blake Estes (itelescope.net)说明: 近距离看李奥纳德彗星会见到什么?虽然我们不能飞到它的旁边,但用小望远镜拍摄这颗彗星的彗发和紧邻彗核的彗尾,应能给我们相近的感受。顾名思义,彗星的离子尾是由电离气体所构成,而这些气体则是受太阳紫外光的电离并受到太阳风的推送。太阳风具有高度的结构性,而且会受到太阳複杂多变的磁场之雕塑。变幻不定的太阳风作用在彗核释出的各种气体之后,就造就了彗尾的複杂结构。此外,在太阳风的宰制下,李奥纳德彗星的彗尾除了指离太阳也摇摆不定。其离子尾的泛蓝色泽,主要来自与电子复合的一氧化碳分子,而环拱彗核的彗发之泛绿色泽,则来自和电子复合的微量双碳分子。暴露在阳光中的双碳分子,大约50小时就会分解,因此离子尾只有靠近彗核这端才有绿晕。这幅主题影像是在1月2日摄于澳洲的塞汀泉天文台。目前要观测李奥纳德彗星的最佳地点在南半球,而它在旋绕过太阳之后,正踏上离开太阳系的旅程。{lamp/}原文:{mtitle title="Comet Leonard Closeup from Australia"/}Image Credit & Copyright: Blake Estes (itelescope.net)Explanation: What does Comet Leonard look like up close?Although we can't go there, imaging the comet's coma and inner tails through a small telescope gives us a good idea. As the name implies, the ion tail is made of ionized gas -- gas energized by ultraviolet light from the Sun and pushed outward by the solar wind. The solar wind is quite structured and sculpted by the Sun's complex and ever changing magnetic field.The effect of the variable solar wind combined with different gas jets venting from the comet's nucleus accounts for the tail's complex structure. Following the wind, structure in Comet Leonard's tail can be seen to move outward from the Sun even alter its wavy appearance over time. The blue color of the ion tail is dominated by recombining carbon monoxide molecules, while the green color of the coma surrounding the head of the comet is created mostly by a slight amount of recombining diatomic carbon molecules.Diatomic carbon is destroyed by sunlight in about 50 hours -- which is why its green glow does not make it far into the ion tail.The featured image was taken on January 2 from Siding Spring Observatory in Australia. Comet Leonard, presently best viewed from Earth's Southern Hemisphere, has rounded the Sun and is now headed out of the Solar System.
2022年01月12日
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2020-09-15
2020年09月15日:金星大气有生命标记"膦"-(Biomarker Phosphine Discovered in the Atmosphere of Venus)
2020年09月15日:金星大气有生命标记"膦"-(Biomarker Phosphine Discovered in the Atmosphere of Venus)--原图下载{mtitle title="金星大气有生命标记"膦""/}Image Credit: ISAS,JAXA, Akatsuki; Processing: Meli thev说明: 有生命体漂浮在金星的大气里吗?虽然这颗地球的姐妹行星,其表面环境咸认过于极端,任何已知的生命体都难以存在,不过金星的高层大气可能较温和,或许空漂的微生物能够存活。金星环境不利于生命存在的看法,随着昨天宣布在金星发现膦之后,出现了意外的反转。化合物膦(PH3)咸认是一种生物标记,地球上的微生物可以合成膦,不过在金星这种石质行星的表面或附近,常见的化学过程应难以合成这种化合物。这幅金星笼罩着厚重云层的主题影像,是由2015年起开始绕行这颗云雾行星的日本无人探测船拂晓号,摄于2个不同的紫外光波段。膦的发现如获得证实,或许会重燃我们在太阳系第二颗行星的大气,寻找漂浮生命体迹证的兴趣。(phosphine 膦){lamp/}原文:{mtitle title="Biomarker Phosphine Discovered in the Atmosphere of Venus"/}Image Credit: ISAS,JAXA, Akatsuki; Processing: Meli thevExplanation: Could there be life floating in the atmosphere of Venus?Although Earth's planetary neighbor has a surface considered too extreme for any known lifeform, Venus' upper atmosphere may be sufficiently mild for tiny airborne microbes.This usually disfavored prospect took an unexpected upturn yesterday with the announcement of the discovery of Venusian phosphine.The chemical phosphine (PH3) is a considered a biomarker because it seems so hard to create from routine chemical processes thought to occur on or around a rocky world such as Venus -- but it is known to be created by microbial life on Earth. The featured image of Venus and its thick clouds was taken in two bands of ultraviolet light bythe Venus-orbing Akatsuki, a Japanese robotic satellite that has been orbiting the cloud-shrouded world since 2015. The phosphine finding, if confirmed, may set off renewed interest in searching for other indications of life floating high in the atmosphere of our Solar System's second planet out from the Sun.
2020年09月15日
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2019-08-29
2019年08月29日:M27: 肯定不是彗星-(M27: Not a Comet)
2019年08月29日:M27: 肯定不是彗星-(M27: Not a Comet)--原图下载{mtitle title="M27: 肯定不是彗星"/}Image Credit &Copyright: Bob Franke说明: 在18世纪的法国夜空搜索彗星时,天文学家梅西叶勤奋地编录了一个肯定不是彗星的天体名册,而这就是现在着名非彗星星表的第27号天体。而在21世纪,天文学家会将它分类为行星状星云,但是实际上它也不是行星,只是用小望远镜观测时,它具有类似行星的圆浑外观而已。梅西叶27(M27)是一个非常典型的发射星云,是类太阳恒星,在耗尽核心的燃料后所产生的。当恒星的外层被抛到太空中时,外层气壳里的原子,受到垂死恒星发出的强烈不可见紫外光之激发,而辐射出可见光,形成了这种称为行星状星云的天体。这团常称为哑铃星云的美丽对称星际云气,位在狐狸座内,离我们约有1,200光年远,宽度则超过2.5光年。这幅精采的彩色影像,除了呈现经常被探索研究的中心区之外,也清楚展现较暗、鲜少有影像记录的外晕。影像整合了宽波段滤镜数据,与及只透过氢和氧原子辐射的窄波段滤镜影像数据。{lamp/}原文:{mtitle title="M27: Not a Comet"/}Image Credit &Copyright: Bob FrankeExplanation: While hunting for comets in the skies above 18th century France,astronomer Charles Messierdiligently kept a list of the thingshe encountered that were definitely not comets.This is number 27 on hisnowfamous not-a-comet list.In fact, 21st century astronomers would identify it as aplanetarynebula, but it's not a planet either, even though it mayappear round andplanet-like in a small telescope.Messier 27 (M27) is an excellent example of a gaseous emission nebulacreated as a sun-like star runs outof nuclear fuel in its core.The nebula forms as the star's outer layers are expelled intospace, with a visible glow generated by atoms excited by the dyingstar's intense but invisibleultraviolet light.Known by the popular name of theDumbbellNebula, the beautifullysymmetric interstellar gas cloud is over 2.5 light-years across andabout 1,200 light-years away in theconstellationVulpecula.This impressive color composite highlights details withinthe well-studied central region and fainter, seldom imagedfeatures in the nebula's outer halo.It incorporates broad and narrowbandimages recorded usingfilters sensitive to emission from hydrogen and oxygen atoms.
2019年08月29日
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2018-05-27
2018年05月27日:太阳的日冕雨-(Coronal Rain on the Sun)
2018年05月27日:太阳的日冕雨-(Coronal Rain on the Sun)--原图下载2018 May 27 {mtitle title="太阳的日冕雨"/}Video Credit: Solar Dynamics Observatory,SVS,GSFC,NASA; Music: Thunderbolt by Lars Leonhard说明: 太阳会下雨吗?会的,只不过降下的不是雨水,而是极端炽热的电浆。例证之一出现在2012年中,当时太阳爆发了日冕物质抛射与中等规模的太阳闪燄,然后接续发生的现象,就非常不寻常。影像记录到邻近的日冕 在降温后回落,形成了日冕雨的景观。不过因为日冕雨物质是带电的电子、质子和离子,所以它们是沿太阳表面的磁圈流动,因此看起来像是超现实的无源头三维瀑布。这部看来意外宁静的精彩影片,摄于紫外光 波段,以突显温度大约50,000度的物质发出之辉光。这部主题缩时影片里的每一秒,真实的拍摄时间约略是6分钟,所以整个日冕雨持续了大约10小时。最近的观测证实,日冕雨可发生在较小的迴圈里,持续的时间则可长至30小时。{lamp/}原文:{mtitle title="Coronal Rain on the Sun"/}Video Credit: Solar Dynamics Observatory,SVS,GSFC,NASA; Music: Thunderbolt by Lars LeonhardExplanation: Does it rain on the Sun?Yes, although what falls is not water but extremely hot plasma.An example occurred in mid-July 2012 after an eruption on the Sun that produced both a Coronal Mass Ejection and a moderate solar flare. What was more unusual, however, was what happened next.Plasma in the nearby solar corona was imaged cooling and falling back, a phenomenon known as coronal rain.Because they are electrically charged, electrons, protons, and ions in the rain were gracefully channeled along existing magnetic loops near the Sun's surface, making the scene appear as a surreal three-dimensional sourceless waterfall.The resulting surprisingly-serene spectacle is shown in ultraviolet light and highlights matter glowing at a temperature of about 50,000 Kelvin.Each second in the featured time lapse video takes about 6 minutes in real time, so that the entire coronal rain sequence lasted about 10 hours.Recent observations have confirmed that that coronal rain can also occur in smaller loops for as long as 30 hours.
2018年05月27日
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2017-06-09
2017年06月09日:M27: 肯定不是彗星-(M27: Not a Comet)
2017年06月09日:M27: 肯定不是彗星-(M27: Not a Comet)--原图下载{mtitle title="M27: 肯定不是彗星"/}Image Credit &Copyright:Data;Subaru, NAOJ,Assembly and Processing;Roberto Colombari说明: 在18世纪的法国夜空中搜索彗星时,天文学家梅西叶勤奋地编录了一个肯定不是彗星的天体名册,而这就是现在着名非彗星编录的第27号天体。在21世纪,天文学家会将它分类为行星状星云,但是实际上它也不是行星,只是用小望远镜观测时,它具有类似行星的圆浑外观而已。梅西叶27(M27)是一个非常典型的发射星云,是类似太阳的恒星在耗尽核心的燃料后所产生的。当恒星的外层被抛到太空中时,外层气壳里的原子,受到垂死恒星所发出的强烈紫外光之激发辐射出可见光,从而形成了这种称为行星状星云的天体。这团亦名为哑铃星云的美丽对称云气,位在狐狸座内,离我们约有1,200光年远,大小则超过2.5光年。这张精采的彩色影像,结合了8.2米昴宿望远镜的宽和窄波段观测数据。{lamp/}原文:{mtitle title="M27: Not a Comet"/}Image Credit &Copyright:Data;Subaru, NAOJ,Assembly and Processing;Roberto ColombariExplanation: While hunting for comets in the skies above 18th century France,astronomer Charles Messierdiligently kept a list of the thingshe encountered that were definitely not comets.This is number 27 on hisnowfamous not-a-comet list.In fact, 21st century astronomers would identify it as aplanetarynebula, but it's not a planet either, even though it mayappear round andplanet-like in a small telescope.Messier 27 (M27) is an excellent example of agaseousemission nebula created as asun-like star runs outof nuclear fuel in its core.The nebula forms as the star's outer layers are expelled intospace, with a visible glow generated by atoms excited by the dyingstar's intense but invisibleultraviolet light.Known by the popular name of theDumbbellNebula, the beautifullysymmetric interstellar gas cloud is over 2.5 light-years across andabout 1,200 light-years away in theconstellationVulpecula.This spectacular color imageincorporates broad and narrowbandobservations recorded by the 8.2 meterSubaru telescope.
2017年06月09日
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2016-03-22
2016年03月22日:亚速尔群岛上空的彩虹气辉-(Rainbow Airglow over the Azores)
[2016年03月22日:亚速尔群岛上空的彩虹气辉-(Rainbow Airglow over the Azores)--原图下载](https://apod.nasa.gov/apod/image/1603/GravityWaves_Claro_1486.jpg"onMouseOver="if (document.images)document.imagename1.src='image/1603/GravityWaves_Claro_Annotated2_960.jpg';"onMouseOut="if (document.images)document.imagename1.src='image/1603/GravityWaves_Claro_960.jpg';){mtitle title="亚速尔群岛上空的彩虹气辉"/}Image Credit & Copyright: Miguel Claro(TWAN); Rollover Annotation: Judy Schmidt说明: 为何天空会出现一道道像庞大彩虹的辉光?因为有气辉。其实大气一直都在发出辉光,只是通常难以察觉而已。不过,如果附近有类似雷暴系统这类的扰动,就会在地球大气中产生可见的波纹。这种空气中的重力波,酷似投石于平静水面所产生的涟漪。这张几乎是顺着气辉峰墙方向拍摄的影像,可能是让这些波动结构特别清晰的原因。不过,它的色彩到底是怎么来的?暗红的气辉可能是来自85公里高处、受到太阳紫外光激发的羟基(OH)分子。泛绿的气辉可能是由略高之处的氧原子所发出。橙色的气辉可能也是源自氧,只是这些原子可能位在二倍高度的地方。这幅主题影像是在攀登葡萄牙.亚速尔群岛的皮可山之时所拍摄。地面的灯火则来自座落于大西洋里的法亚尔岛。在这些带状气辉后方的精采天空中,有向上伸展的银河系盘面,以及位在影像上左方的仙女座大星系M31。{lamp/}原文:{mtitle title="Rainbow Airglow over the Azores"/}Image Credit & Copyright: Miguel Claro(TWAN); Rollover Annotation: Judy SchmidtExplanation: Why would the sky glow like a giant repeating rainbow? Airglow. Now air glows all of the time, but it is usually hard to see.A disturbance however -- like an approaching storm -- may cause noticeable rippling in the Earth's atmosphere.These gravity waves are oscillations in air analogous to those created when a rock is thrown in calm water. The long-duration exposure nearly along the vertical walls of airglow likely made the undulating structure particularly visible. OK, but where do the colors originate? The deep red glow likely originates from OH molecules about 87-kilometers high, excited by ultraviolet light from the Sun.The orange and green airglow is likely caused by sodium and oxygen atoms slightly higher up. The featured image was captured during a climb up Mount Pico in the Azores of Portugal. Ground lights originate from the island of Faial in the Atlantic Ocean. A spectacular sky is visible through this banded airglow, with the central band of our Milky Way Galaxy running up the image center, and M31, the Andromeda Galaxy, visible near the top left.
2016年03月22日
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