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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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欢迎来到人生天地间
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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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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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2024-04-01
2024年04月01日:银河中心黑洞周围的涡状磁场-(Swirling Magnetic Field around Our Galaxy's Central Black Hole)
2024年04月01日:银河中心黑洞周围的涡状磁场-(Swirling Magnetic Field around Our Galaxy's Central Black Hole)--原图下载{mtitle title="银河中心黑洞周围的涡状磁场"/}Image Credit: EHT Collaboration说明: 银河中心的大黑洞发生了什么事?它正在吸取一个涡状盘里的物质,而这个盘己确定受到磁化。具体来说,最近发现银河黑洞的吸积盘 会发出偏振光,而这种型态的辐射通常与磁化源有关。这张图为银河中心黑洞人马A(Sgr A)的特写,而此图是由世界各地参与事件视界望远镜(EHT)合作计画的无线电望远镜所拍摄的。图上叠加的示意曲线,显示偏振光可能是由涡状的磁化气体所发出的,而这些气体即将掉进这颗质量超过4百万倍太阳的中心黑洞里。这张影像的中心区之所以很黝黑,可能是因为我们与黑洞的黝黑事件 视界之间,几乎没有发光的气体所致。使用事件视界望远镜对这个黑洞及M87中心黑洞进行长期监测,或许能取得黑洞的重力及掉入的物质如何产生吸积盘和喷流之新线索。{lamp/}原文:{mtitle title="Swirling Magnetic Field around Our Galaxy's Central Black Hole"/}Image Credit: EHT CollaborationExplanation: What's happening to the big black hole in the center of our galaxy? It is sucking in matter from a swirling disk -- a disk that is magnetized, it has now been confirmed.Specifically, the black hole's accretion disk has recently been seen to emit polarized light, radiation frequently associated with a magnetized source.Pictured here is a close-up of Sgr A*, our Galaxy's central black hole, taken by radio telescopes around the world participating in the Event Horizon Telescope (EHT) Collaboration. Superposed are illustrative curved lines indicating polarized light likely emitted from swirling magnetized gas that will soon fall into the 4+ million mass central black hole. The central part of this image is likely dark because little light-emitting gas is visible between us and the dark event horizon of the black hole. Continued EHT monitoring of this and M87's central black hole may yield new clues about the gravity of black holes and how infalling matter creates disks and jets.
2024年04月01日
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2023-11-26
2023年11月26日:源自彗星67P表面的尘埃喷流-(A Dust Jet from the Surface of Comet 67P)
2023年11月26日:源自彗星67P表面的尘埃喷流-(A Dust Jet from the Surface of Comet 67P)--原图下载{mtitle title="源自彗星67P表面的尘埃喷流"/}Image Credit: ESA, Rosetta, MPS, OSIRIS;UPD/LAM/IAA/SSO/INTA/UPM/DASP/IDA说明: 彗星的彗尾来自何处呢?在彗星的彗核上,好像没有会发出喷流形成彗尾的特定位置。不过,在2016年欧洲航天局的罗塞塔号太空船,不但拍摄到一道源自彗星67P/丘泽的喷流,而且还直接穿过它。这幅说服力十足的主题影像,呈现了一道明亮的羽状烟尘,从紧贴着一座10米高墙的圆形凹地喷出。分析罗塞塔号的数据证实,这道喷流的组成是尘埃和水冰。这片崎岖不过很单调的原野显示,产生喷流的源头可能远在多孔的表面之下。这幅影像拍摄的时间点,大约在罗塞塔号进行受控撞击彗星67P表面终结任务的前二个月。{lamp/}原文:{mtitle title="A Dust Jet from the Surface of Comet 67P"/}Image Credit: ESA, Rosetta, MPS, OSIRIS;UPD/LAM/IAA/SSO/INTA/UPM/DASP/IDAExplanation: Where do comet tails come from? There are no obvious places on the nuclei of comets from which the jets that create comet tails emanate. In 2016, though, ESA's Rosetta spacecraft not only imaged a jet emerging from Comet 67P/Churyumov-Gerasimenko, but flew right through it. Featured is a telling picture showing a bright plume emerging from a small circular dip bounded on one side by a 10-meter high wall. Analyses of Rosetta data show that the jet was composed of both dust and water-ice.The rugged but otherwise unremarkable terrain indicates that something likely happened far under the porous surface to create the plume. This image was taken about two months before Rosetta's mission ended with a controlled impact onto Comet 67P's surface.
2023年11月26日
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2023-07-13
2023年07月13日:韦伯望远镜的心宿增四星云-(Webb's Rho Ophiuchi)
2023年07月13日:韦伯望远镜的心宿增四星云-(Webb's Rho Ophiuchi)--原图下载{mtitle title="韦伯望远镜的心宿增四星云"/}Image Credit:NASA,ESA,CSA,STScI,Klaus Pontoppidan (STScI),Processing: Alyssa Pagan (STScI)说明: 距离我们仅有390光年的蛇夫座心宿增四星云複合体,是最邻近地球的恒星形成区,而类太阳恒星及未来的行星系统正形成于其中。韦伯太空望远镜的近红外相机,最近以空前细緻的尺度,为这个混乱喧嚣的育婴室拍下了这幅红外光影像。并以这幅刚发布壮丽的宇宙快照,来庆贺韦伯望远镜探索宇宙的第一年任务大获成功。这幅影像呈现心宿增四星云不到1光年的区域及大约50颗年轻恒星。其中较亮的恒星,更带着韦伯望远镜特有的衍射芒。源自新诞生恒星的庞大激震分子氢喷流,在此影像里以红色来呈现,此外,还可见到一个大型的泛黄尘埃空穴,及其中心附近清出这个空穴的活跃年轻恒星。在这幅引人讚叹影像的部分恒星附近,甚至可见到它们的原行星盘所投射的影子。(Rho Ophiuchi 心宿增四星云){lamp/}原文:{mtitle title="Webb's Rho Ophiuchi"/}Image Credit:NASA,ESA,CSA,STScI,Klaus Pontoppidan (STScI),Processing: Alyssa Pagan (STScI)Explanation: A mere 390 light-years away,Sun-like stars and future planetary systems are forming inthe Rho Ophiuchi molecular cloud complex,the closest star-forming region to our fair planet.The James Webb Space Telescope's NIRCam peeredinto the nearby natal chaosto capture this infrared image atan inspiring scale.The spectacular cosmic snapshot was released to celebrate the successfulfirst year ofWebb's explorationof the Universe.The frame spansless than a light-year across the Rho Ophiuchi regionand contains about 50 young stars.Brighter stars clearly sport Webb's characteristic pattern ofdiffraction spikes.Huge jets of shocked molecular hydrogenblasting fromnewborn stars are red in the image, withthe large, yellowish dusty cavity carved out by the energeticyoung star near its center.Near some stars in the stunning image are shadows cast by theirprotoplanetary disks.
2023年07月13日
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2023-05-03
2023年05月03日:半人马座A:特殊的星系-(Centaurus A: A Peculiar Island of Stars)
2023年05月03日:半人马座A:特殊的星系-(Centaurus A: A Peculiar Island of Stars)--原图下载{mtitle title="半人马座A:特殊的星系"/}Image Credit & Copyright: Marco Lorenzi,Angus Lau & Tommy Tse; Text: Natalia Lewandowska (SUNY Oswego)说明: 星系是很迷人的天体。星系光靠重力,就能将大量的恒星、尘埃、星际气体、恒星残骸、和暗物质聚集在一起。这幅影像所呈现的是距离约1200万光年远,天空中第五亮的星系;其编录号为NGC 5128,不过更常见的称号是半人马A(Centaurus A)。半人马A的扭曲外观,咸认是椭圆星系和螺旋星系合併后的产物。半人马A拥有活跃的星系核,其中心有质量是太阳5500万倍的超大质量黑洞。这个中心黑洞射出的高速喷流,在无线电及X射线波段皆可见。而在影像左上角,还可见到位在喷流指向的泛红丝状物。事件视界望远镜的新观测显示,这道喷流边缘在增亮,然而其成因不明,目前为活跃的研究课题。{lamp/}原文:{mtitle title="Centaurus A: A Peculiar Island of Stars"/}Image Credit & Copyright: Marco Lorenzi,Angus Lau & Tommy Tse; Text: Natalia Lewandowska (SUNY Oswego)Explanation: Galaxies are fascinating.In galaxies, gravity alone holds together massive collections of stars, dust, interstellar gas, stellar remnants and dark matter. Pictured is NGC 5128, better known as Centaurus A. Cen A is the fifth brightest galaxy on the sky and is located at a distance of about 12 million light years from Earth.The warped shape of Cen A is the result of a merger between an elliptical and a spiral galaxy. Its active galactic nucleus harbors a supermassive black hole that is about 55 million times more massive than our Sun. This central black hole ejects a fast jet visible in both radio and X-ray light.Filaments of the jet are visible in red in the upper left. New observations by the Event Horizon Telescope have revealed a brightening of the jet only towards its edges -- but for reasons that are currently unknown and an active topic of research.
2023年05月03日
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2022-12-12
2022年12月12日:IC 1396的不寻常云球-(An Unusual Globule in IC 1396)
2022年12月12日:IC 1396的不寻常云球-(An Unusual Globule in IC 1396)--原图下载{mtitle title="IC 1396的不寻常云球"/}Image Credit & Copyright: Bernard Miller说明: 有怪物藏在IC 1396里吗?这根名为象鼻星云的云柱,是一个气体与尘埃云恒星形成区之一部份,而它乍看之下形状有些赫人,甚至有点带着人形。然而,该处真正的怪物,其实只是一颗离地球很远而与人无害的明亮年轻恒星。来自这颗恒星的高能量星光,正逐渐侵蚀这幅主题影像上缘的黝黑彗星状云球的尘埃。同时,源自这颗恒星的喷流与粒子恒星风,也将周围的气体和尘埃往外面推。离我们将近3,000光年远的黯淡IC 1396複合体,张角超过10个满月,跨幅远大于影像所显示的区域。{lamp/}原文:{mtitle title="An Unusual Globule in IC 1396"/}Image Credit & Copyright: Bernard MillerExplanation: Is there a monster in IC 1396? Known to some as the Elephant's Trunk Nebula, parts of gas and dust clouds of this star formation region may appear to take on foreboding forms, some nearly human. The only real monster here, however, is a bright young star too far from Earth to hurt us. Energetic light from this star is eating away the dust of the dark cometary globule near the top of the featured image. Jets and winds of particles emitted from this star are also pushing away ambient gas and dust. Nearly 3,000 light-years distant, the relatively faint IC 1396 complex covers a much larger region on the sky than shown here, with an apparent width of more than 10 full moons.
2022年12月12日
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2021-06-23
2021年06月23日:星力的恆星形成模拟-(STARFORGE: A Star Formation Simulation)
2021年06月23日:星力的恆星形成模拟-(STARFORGE: A Star Formation Simulation)--原图下载2021 June 23 {mtitle title="星力的恆星形成模拟"/}Video & Text Credit: Michael Y. Grudić (Northwestern U.) et al., STARFORGE Collaboration; Music: Prelude, Op. 28, No. 4 in E Minor (Frédéric Chopin)说明: 恒星是如何形成的?恒星大多形成于星系盘面的巨分子云之内。而恒星形成过程的触发、影响及限制因子,则为恒星风、喷流、高能星光、和先前世代恒星的超新星爆炸。这部来自星力计算模拟的主题影片,呈现在一团质量为20,000倍太阳的气体云里,这些因子的複杂交互作用。在这部缩时的视象化影片里,较淡色的区域气体密度较高,色彩则标示气体的速率(紫色较慢,橙色为高速),而点为新形成恒星的位置。在这部影片开头时,一团宽约50光年的气体云,在本身重力的作用下开始聚集。在2百万年内,第一批恒星形成,而且新诞生的大质量恒星发出让人印象深刻的喷流。这项模拟定格在4百30万年,然后整个体积旋转提供3维视角。关于恒星形成目前还有非常多的未知,包括喷流在限制后续形成的恒星之质量所扮演的角色。(STARFORGE simulation 星力模拟){lamp/}原文:{mtitle title="STARFORGE: A Star Formation Simulation"/}Video & Text Credit: Michael Y. Grudić (Northwestern U.) et al., STARFORGE Collaboration; Music: Prelude, Op. 28, No. 4 in E Minor (Frédéric Chopin)Explanation: How do stars form? Most form in giant molecular clouds located in the central disk of a galaxy. The process is started, influenced, and limited by the stellar winds, jets, high energy starlight, and supernova explosions of previously existing stars.The featured video shows these complex interactions as computed by the STARFORGE simulation of a gas cloud 20,000 times the mass of our Sun.In the time-lapse visualization, lighter regions indicate denser gas, color encodes the gas speed (purple is slow, orange is fast), while dots indicate the positions of newly formed stars.As the video begins, a gas cloud spanning about 50 light years begins to condense under its own gravity. Within 2 million years, the first stars form, while newly formed massive stars are seen to expel impressive jets.The simulation is frozen after 4.3 million years, and the volume then rotated to gain a three-dimensional perspective.Much remains unknown about star formation, including the effect of the jets in limiting the masses of subsequently formed stars.
2021年06月23日
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