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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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2021-06-28
2021年06月28日:纸月亮与日食-(A Paper Moon Solar Eclipse)
2021年06月28日:纸月亮与日食-(A Paper Moon Solar Eclipse)--原图下载{mtitle title="纸月亮与日食"/}Image Credit & Copyright: Wang Letian (Eyes at Night)说明: 乍看之下,影像似在呈现一轮纸月亮,滑过帆布太阳的前方。不过,影像里的云朵不是纸板云,而场景也非虚构。这幅主题影像里的橙色天空是真的,内容则是摄于这个月稍早日食期间2张照片的数位叠合。在使用一般望远镜拍摄的第1张照片,里头有过曝的太阳和曝光不足的月亮。第2张来自太阳望远镜的照片,记录了背景太阳色球的细微结构。其中,太阳帆布般的纹理,则是在氢的特定红光波段取像的产物。此外,在太阳的临边可见到数个日珥。这幅日落时分影像,摄于中国.内蒙古自治区的锡林郭勒盟。其他一些非虚构的事实,还包括:月球的成分是緻密的岩石、太阳 是一团炽热的气体、以及云是漂浮在空中的成团水与冰晶微粒。{lamp/}原文:{mtitle title="A Paper Moon Solar Eclipse"/}Image Credit & Copyright: Wang Letian (Eyes at Night)Explanation: It may look like a paper Moon. Sailing past a canvas Sun. But those are not cardboard clouds. And it's not make believe. The featured picture of an orange colored sky is real -- a digital composite of two exposures of the solar eclipse that occurred earlier this month. The first exposure was taken with a regular telescope that captured an overexposed Sun and an underexposed Moon, while the second image was taken with a solar telescope that captured details of the chromosphere of the background Sun.The Sun's canvas-like texture was brought up by imaging in a very specific shade of red emitted by hydrogen. Several prominences can be seen around the Sun's edge. The image was captured just before sunset from Xilingol, Inner Mongolia, China.It's also not make-believe to imagine that the Moon is made of dense rock, the Sun is made of hot gas, and clouds are made of floating droplets of water and ice.
2021年06月28日
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2020-08-17
2020年08月17日:银河四周的英仙座流星-(Perseids Around the Milky Way)
[2020年08月17日:银河四周的英仙座流星-(Perseids Around the Milky Way)--原图下载](https://apod.nasa.gov/apod/image/2008/PerseidBridge_Zhang_4032.jpg"onMouseOver="if (document.images)document.imagename1.src='image/2008/PerseidBridge_Zhang_1080_annotated.jpg';"onMouseOut="if (document.images)document.imagename1.src='image/2008/PerseidBridge_Zhang_1080.jpg';){mtitle title="银河四周的英仙座流星"/}Image Credit & Copyright: Jingyi Zhang说明: 为何这些英仙流星痕是弯曲的?它们是把几乎整个天空,人为压缩成长方形时所造成的效应。这些流星,则是上星期达到极大期的英仙流星雨之成员。这幅由多张照片组合而成的主题影像,除了记录360度的天空之外,也纪录了在不同时段明亮英仙流星掠过长空的景象。这些看以弯曲但其实是笔直的英仙流星痕,全都可回溯到左下角英仙座内的辐射源。不过,虽然英仙流星全都源自英仙座内的辐射源,但它们可出现在天空的任何地方。这幅影像,摄于中国.内蒙古的草原与沙丘接壤之处。在这片忙碌的夜空中,还可见到许多夜空珍宝,包括我们银河系的中央盘面、右侧的土星与木星、中左方的美丽气辉、及近处的地球浮云。英仙流星雨的极大期,每年都出现在8月。{lamp/}原文:{mtitle title="Perseids Around the Milky Way"/}Image Credit & Copyright: Jingyi ZhangExplanation: Why would meteor trails appear curved?The arcing effect arises only because the image artificially compresses (nearly) the whole sky into a rectangle.The meteors are from the Perseid Meteor Shower that peaked last week.The featured multi-frame image combines not only different directions from the 360 projection, but different times when bright Perseid meteors momentarily streaked across the sky.All Perseid meteors can be traced back to the constellation Perseus toward the lower left, even the seemingly curved (but really straight) meteor trails. Although Perseids always point back to their Perseus radiant, they can appear almost anywhere on the sky.The image was taken from Inner Mongolia, China, where grasslands meet sand dunes.Many treasures also visible in the busy night sky including the central arch of ourMilky Way Galaxy, the planets Saturn and Jupiter toward the right, colorful airglow on the central left, and some relatively nearby Earthly clouds.The Perseid Meteor Shower peaks every August.
2020年08月17日
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2020-07-22
2020年07月22日:NEOWISE彗星节理分明的彗尾-(The Structured Tails of Comet NEOWISE)
2020年07月22日:NEOWISE彗星节理分明的彗尾-(The Structured Tails of Comet NEOWISE)--原图下载{mtitle title="NEOWISE彗星节理分明的彗尾"/}Image Credit & Copyright: Zixuan Lin (Beijing Normal U.)说明: NEOWISE彗星彗尾里的结构是怎么产生的?在它清楚可见的二道长尾里,左侧泛蓝的离子尾,在流泛带电的太阳风推送下,指向远离太阳的方向。离子尾里的结构,是因为彗核排放发蓝光的离子之速率不均,以及複杂的太阳风之风速不停变动所致。不过,NEOWISE彗星(C/2020 F3)最特殊的的是它波浪状的尘尾。尘尾源自被阳光光压推出的小碎片,因为这些尘埃微粒较重较能抵抗光压,因此形成散落在彗星绕日的轨道上的弯曲尘尾。NEOWISE彗星壮观尘尾上的分层结构之成因,目前尚未完全釐清,不过可能和5公里宽彗核上的冰溶化时,释放出的反光砂砾流,因彗核转动而迴旋喷洒有关。这幅组合40张数位强化照片的主题影像,是在3天前摄于中国.内蒙古.戈壁沙漠的幽暗星空下。在远离太阳的返程中,明天NEOWISE彗星将运行到最接近地球的位置。这颗已开始变暗的彗星,目前肉眼仍然可见,不过在远离地球后,将会快速变暗。{lamp/}原文:{mtitle title="The Structured Tails of Comet NEOWISE"/}Image Credit & Copyright: Zixuan Lin (Beijing Normal U.)Explanation: What is creating the structure in Comet NEOWISE's tails?Of the two tails evident, the blue ion tail on the left points directly away from the Sun and is pushed out by the flowing and charged solar wind.Structure in the ion tail comes from different rates of expelled blue-glowing ions from the comet's nucleus, as well as the always complex and continually changing structure of our Sun's wind.Most unusual for Comet C/2020 F3 (NEOWISE), though, is the wavy structure of its dust tail.This dust tail is pushed out by sunlight, but curves as heavier dust particles are better able to resist this light pressure and continue along a solar orbit. Comet NEOWISE's impressive dust-tail striations are not fully understood, as yet, but likely related to rotating streams of sun-reflecting grit liberated by ice melting on its 5-kilometer wide nucleus. The featured 40-image conglomerate, digitally enhanced, was captured three days ago through the dark skies of the Gobi Desert in Inner Mongolia, China.Comet NEOWISE will make it closest pass to the Earth tomorrow as it moves out from the Sun.The comet, already fading but still visible to the unaided eye, should fade more rapidly as it recedes from the Earth.
2020年07月22日
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2018-10-30
2018年10月30日:内蒙古上空的猎户座流星-(Orionids Meteors over Inner Mongolia)
2018年10月30日:内蒙古上空的猎户座流星-(Orionids Meteors over Inner Mongolia)--原图下载{mtitle title="内蒙古上空的猎户座流星"/}Image Credit & Copyright: Yin Hao说明: 流星不停的从猎户座射出来。不过,这是预料中的现象,因为每年的十月是猎户座流星雨的季节。上面这幅去年十月摄于中国.内蒙古的影像,呈现了20多颗接连出现在乌兰哈达火山上空的流星。这张主题影像里的众多流星痕 ,都可回溯到猎户腰带左上方,称为辐射点的小片天区。猎户座流星的前身,是哈雷彗星历次回归内太阳系时,所喷出的沙粒大小碎片。哈雷彗星其实造成了二群已知的流星雨,另一群是在每年五月可见的宝瓶η流星雨。每日天文图在一年前的今天所呈现之猎户座流星影像,除了摄于相同地点之外,也记录了同一部车子。在下个月,坦普─塔托彗星所造成的狮子座流星雨,应该会出现一些很明亮的流星痕。{lamp/}原文:{mtitle title="Orionids Meteors over Inner Mongolia"/}Image Credit & Copyright: Yin HaoExplanation: Meteors have been shooting out from the constellation of Orion. This was expected, as October is the time of year for the Orionids Meteor Shower. Pictured here, over two dozen meteors were caught in successively added exposures last October over Wulan Hada volcano in Inner Mongolia, China.The featured image shows multiple meteor streaks that can all be connected to a single small region on the sky called the radiant,here visible just above and to the left of the belt of Orion, The Orionids meteors started as sand sized bits expelled from Comet Halley during one of its trips to the inner Solar System. Comet Halley is actually responsible for two known meteor showers, the other known as the Eta Aquarids and visible every May. An Orionids image featured on APOD one year ago today from the same location shows the same car. Next month, the Leonids Meteor Shower from Comet Tempel-Tuttle should also result in some bright meteor streaks.
2018年10月30日
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2017-12-13
2017年12月13日:内蒙古上空的流星-(Meteors over Inner Mongolia)
2017年12月13日:内蒙古上空的流星-(Meteors over Inner Mongolia)--原图下载{mtitle title="内蒙古上空的流星"/}Image Credit & Copyright: Haitong Yu说明: 你有沐浴在流星雨里的经验吗?如果有,就会注意到大约每隔一分钟,天空会因稍纵即逝的闪光而突然亮起来。而这正是去年英仙座流星雨期间,上面影像里这位天文摄影者的亲身经历。在这幅全长3小时的组合主题影像拍摄间,大约有90颗英仙座流星,从中国.内蒙古的多伦湖上空掠过。如果你沿这些流星痕回溯,将会发现大部分流星看似辐射自单一个星座(在此案例为英仙座)。事实上,你甚至能分辨那些并非英仙座流星,因为它们的轨迹不同。今晚适逢双子座流星雨极大期,所以可能是另一个体验流星雨的好夜晚。而作为双子座流星雨辐射点的双子座,会在日落后不久升起并且彻夜可见。{lamp/}原文:{mtitle title="Meteors over Inner Mongolia"/}Image Credit & Copyright: Haitong YuExplanation: Did you ever get caught in a meteor shower?If yes, then every minute or so the sky sparked with fleeting flashes of light.This was the fate of the pictured astrophotographer during last year's Perseids meteor shower.During the featured three-hour image composite, about 90 Perseids rained down above Lake Duolun of Inner Mongolia, China.If you trace back the meteor streaks, you will find that most of them appear to radiate from a single constellation -- in this case Perseus.In fact, you can even tell which meteors are not Perseids because they track differently.Tonight promises to be another good night to get caught in a meteor shower because it is the peak for the Geminids.Gemini, the shower radiant, should rise shortly after sunset and be visible most of the night.
2017年12月13日
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2017-10-30
2017年10月30日:猎户座流星雨-(Orionid Meteors from Orion)
2017年10月30日:猎户座流星雨-(Orionid Meteors from Orion)--原图下载{mtitle title="猎户座流星雨"/}Image Credit & Copyright: Lu Shupei说明: 流星不停的从猎户座射出来。不过,这是预料中的现象,因为每年的十月是猎户座流星雨的季节。上面这幅上个周末摄于中国.内蒙古的影像,呈现了超过12颗接连出现在乌兰哈达火山上空的流星。这张主题影像里的多重流星痕,都可回溯到猎户腰带左上方,称为辐射点的小片天区。猎户座流星的前身,是哈雷彗星历次回归太阳系内围时,所喷出的沙粒大小碎片。哈雷彗星其实造成了二群已知的流星雨,另一群是在每年五月可见的宝瓶η流星雨。在下个月,坦普─塔托彗星所造成的狮子座流星雨,应该会出现一些很明亮的流星痕。{lamp/}原文:{mtitle title="Orionid Meteors from Orion"/}Image Credit & Copyright: Lu ShupeiExplanation: Meteors have been shooting out from the constellation of Orion. This was expected, as October is the time of year for the Orionids Meteor Shower. Pictured here, over a dozen meteors were caught in successively added exposures last weekend over Wulan Hada volcano in Inner Mongolia, China.The featured image shows multiple meteor streaks that can all be connected to a single small region on the sky called the radiant,here visible just above and to the left of the belt of Orion, The Orionids meteors started as sand sized bits expelled from Comet Halley during one of its trips to the inner Solar System. Comet Halley is actually responsible for two known meteor showers, the other known as the Eta Aquarids and visible every May. Next month, the Leonids Meteor Shower from Comet Tempel-Tuttle should also result in some bright meteor streaks.
2017年10月30日
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