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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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2024-01-29
2024年01月29日:昴宿星团:有尘埃环绕的七姐妹星团-(The Pleiades: Seven Dusty Sisters)
2024年01月29日:昴宿星团:有尘埃环绕的七姐妹星团-(The Pleiades: Seven Dusty Sisters)--原图下载{mtitle title="昴宿星团:有尘埃环绕的七姐妹星团"/}Image Credit & Copyright: Craig Stocks说明: 着名的昴宿星团正在缓缓摧毁路过的部分气体与尘埃云。昴宿星团是地球天空中最明亮的疏散星团之一,几乎在北半球的任何地方,都能用肉眼看到它的身影。在过去的100,000年里,一大片气体与尘埃恰好穿过昴宿星团,造成恒星和尘埃之间的强烈反应。这团路过的云,可能是雷德克利夫波的一部分,而拉德克利夫波则是不久才发现的、连接了我们邻近银河系的数个恒星形成区之气体和尘埃结构。来自恒星光压会显着的排斥周围泛蓝反射星云里的尘埃,其中颗粒较小的尘埃,所受到的排斥力较大。短期的结果是部分的尘埃云纠结成丝状并发生分层。这张整合了将近9小时长曝光数据的主题深空影像,是在去年由美国 犹他州的犹他沙漠远距天文台所拍摄的。(Radcliffe wave 雷德克利夫波){lamp/}原文:{mtitle title="The Pleiades: Seven Dusty Sisters"/}Image Credit & Copyright: Craig StocksExplanation: The well-known Pleiades star cluster is slowly destroying part of a passing cloud of gas and dust.The Pleiades is the brightest open cluster of stars on Earth's sky and can be seen from almost any northerly location with the unaided eye. Over the past 100,000 years, a field of gas and dustis moving by chance right through the Pleiades star cluster and is causing a strong reaction between the stars and dust.The passing cloud might be part of the Radcliffe wave, a newly discovered structure of gas and dust connecting several regions of star formation in the nearby part of our Milky Way galaxy. Pressure from the stars' light significantly repels the dust in the surrounding bluereflection nebula, with smaller dust particles being repelled more strongly. A short-term result is that parts of the dust cloud have become filamentary and stratified.The featured deep image incorporates nearly 9 hours of exposure and was captured from Utah Desert Remote Observatory in Utah, USA, last year.
2024年01月29日
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2024-01-16
2024年01月16日:肉眼几乎可见的猎户座-(The Orion You Can Almost See)
[2024年01月16日:肉眼几乎可见的猎户座-(The Orion You Can Almost See)--原图下载](https://apod.nasa.gov/apod/image/2401/OrionMcc_Guzzini_1366.jpg"onMouseOver="if (document.images)document.imagename1.src='image/2401/OrionMcc_Guzzini_960_annotated.jpg';"onMouseOut="if (document.images)document.imagename1.src='image/2401/OrionMcc_Guzzini_960.jpg';){mtitle title="肉眼几乎可见的猎户座"/}Image Credit & Copyright: Michele Guzzini说明: 你认得这个星座吗?儘管它是天空中最容易辨认的星群之一,但这种与肉眼所见比较更加完整的猎户座,只有透过长曝光数位相机成像及电脑后製处理才得以显现。在此影像里,带着深橙色调的低温红巨星参宿四,是位于左上角的最明亮恒星。猎户座的炽热泛蓝恒星数量众多,其中,右下角的超巨星参宿七,亮度足以和左上角的参宿四相抗衡,而右上角的亮星则是参宿五。距离我们全约为1,500光年远的猎户腰带三星,皆诞生于猎户座备受研究的星际云里。猎户腰带下方有一片明亮但模糊的光斑,它看来或许也有点眼熟,这是因为它是名为猎户大星云的恒星孕育室。最后是肉眼勉强可见但相当引人注目的巴纳德环,这团环拱在猎户腰带和猎户大星云周围的庞大发射星云,是由猎户座摄影先锋巴纳德发现于100多年前。(Betelgeuse 参宿四; Rigel 参宿七; Bellatrix 参宿五; Barnard's Loop 巴纳德环; Hatysa 伐三; Alnitak 参宿一; Alnilam 参宿二; Mintaka 参宿三; Saiph 参宿六; Cursa 玉井三-波江座){lamp/}原文:{mtitle title="The Orion You Can Almost See"/}Image Credit & Copyright: Michele GuzziniExplanation: Do you recognize this constellation? Although it is one of the most recognizable star groupings on the sky, this is a more full Orion than you can see -- an Orion only revealed with long exposure digital camera imaging and post-processing. Here the cool red giant Betelgeuse takes on a strong orange tint as the brightest star on the upper left. Orion's hot blue stars are numerous, with supergiant Rigel balancing Betelgeuse on the lower right, and Bellatrix at the upper right.Lined up in Orion's belt are three stars all about 1,500 light-years away, born from the constellation's well-studied interstellar clouds.Just below Orion's belt is a bright but fuzzy patch that might also look familiar -- the stellar nursery known as Orion's Nebula. Finally, just barely visible to the unaided eye but quite striking here is Barnard's Loop -- a huge gaseous emission nebula surrounding Orion's Belt and Nebula discovered over 100 years ago by the pioneering Orion photographer E. E. Barnard.
2024年01月16日
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2022-07-11
2022年07月11日:撒哈拉沙漠上空的仙女大星系-(Andromeda over the Sahara Desert)
2022年07月11日:撒哈拉沙漠上空的仙女大星系-(Andromeda over the Sahara Desert)--原图下载{mtitle title="撒哈拉沙漠上空的仙女大星系"/}Credit & Copyright: Jordi Coy说明: 你能看到的最古老“物体”是什么?以肉眼可见为限的话,答案是2百50万光年远的仙女大星系,因为来自它的光要经过2百50万年才能传到你的眼睛里。其他夜空中可见的天体,诸如恒星、星团和星云,距离通常介于数百到数千光年之间,因此近在我们银河系之内。以距离来论仙女大星系也是你能见到最远的“物体"。在这幅上个月摄于摩洛哥的撒哈拉沙漠的主题影像里,亦名为M31的仙女大星系,是中心处经过放大的特写天体。这幅影像组合了3张背景和1张前景照片,它们都是由同一部相机于同一个曆日在同一地点所拍摄,背景照片则是摄于蓝色时段。其中,仙女大星系的伴星系M110,位在M31核心的左上方。能以肉眼见到我们银河系的近邻或许很酷,不过长曝光影相机影像,更能呈现许多暗淡却令人屏息的细节。近来的观测数据指出,我们的银河系和大小相近的仙女大星系,在数十亿年之内就会撞在一起并合而为一。{lamp/}原文:{mtitle title="Andromeda over the Sahara Desert"/}Credit & Copyright: Jordi CoyExplanation: What is the oldest thing you can see?At 2.5 million light years distant, the answer for the unaided eye is the Andromeda galaxy, because its photons are 2.5 million years old when they reach you.Most other apparent denizens of the night sky -- stars, clusters, and nebulae -- appear as they were only a few hundred to a few thousand years ago, as they lie well within our own Milky Way Galaxy. Given its distance, light from Andromeda is likely also the farthest object that you can see. Also known as M31, the Andromeda Galaxy dominates the center of the featured zoomed image, taken from the Sahara Desert in Morocco last month. The featured image is a combination of three background and one foreground exposure -- all taken with the same camera and from the same location and on the same calendar day -- with the foreground image taken during the evening blue hour.M110, a satellite galaxy of Andromenda is visible just above and to the left of M31's core.As cool as it may be to see this neighboring galaxy to our Milky Way with your own eyes, long duration camera exposures can pick up many faint and breathtaking details. Recent data indicates that our Milky Way Galaxy will collide and combine with the similarly-sized Andromeda galaxy in a few billion years.
2022年07月11日
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2022-05-21
2022年05月21日:行星状星云Abell 7-(Planetary Nebula Abell 7)
2022年05月21日:行星状星云Abell 7-(Planetary Nebula Abell 7)--原图下载{mtitle title="行星状星云Abell 7"/}Image Credit &Copyright:Donald Waid,Ron Dilulio说明: 在地球天空中,极为昏暗的行星状星云Abell 7位在猎户座之南的天兔座内,离我们约有1,800光年远。这 团周围环拱着许多银河系恒星的星云,视线上恰好与许多背景星系重叠,然而在这幅深空望远镜影像里,其直径约8光年、形状近乎球形的外观清楚可辨。此外,它内部美丽但较複的结构,也因透过窄波段滤镜成像而得以突显出来。在这幅自然色泽的Abell 7影像里,来自氢和氮的辐射上色为红色,而氧的辐射则以蓝-绿色来呈现,让这团极昏暗肉眼不得见的星云能为我们所观赏。在恒星演化过程中,行星状星云是极为短暂演化终点阶段的代表性天体,在此範例里,也是星云中心那颗前身为类太阳恒星所抛出的外层气壳,而我们的太阳在50亿年之后也将经历此一阶段。据估计,Abell 7的年龄约为20,000年,而星云中心那颗逐渐暗去的白矮星,其年龄则在100亿年左右。{lamp/}原文:{mtitle title="Planetary Nebula Abell 7"/}Image Credit &Copyright:Donald Waid,Ron DilulioExplanation: Very faint planetary nebula Abell 7 is some 1,800 light-years distant,just south of Orion in planet Earth's skies in the constellationLepus, The Hare.Surrounded by Milky Way stars and near the line-of-sight todistant background galaxies, itsgenerallysimple spherical shape, about 8 light-years in diameter, is outlined inthis deep telescopic image.Within its confines are beautiful, more complex details enhancedby the use of narrowband filters.Emission from hydrogen is shown in reddish hues with oxygenemission mapped to green and blue colors, giving Abell 7 a naturalappearance that would otherwise be much too faint to be appreciatedby eye.A planetarynebula represents a very brief final phasein stellar evolution that our own Sun will experience 5 billionyears hence,as the nebula's central, once sun-like starshrugs off its outer layers.Abell 7 itself is estimated to be 20,000 years old.Its central star is seen here as afading white dwarfsome 10 billion years old.
2022年05月21日
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2021-12-13
2021年12月13日:冰岛上空的流星和极光-(Meteors and Auroras over Iceland)
[2021年12月13日:冰岛上空的流星和极光-(Meteors and Auroras over Iceland)--原图下载](https://apod.nasa.gov/apod/image/2112/auroraemeteors_boardman_4591.jpg"onMouseOver="if (document.images)document.imagename1.src='image/2112/auroraemeteors_boardman_annotated_1080.jpg';"onMouseOut="if (document.images)document.imagename1.src='image/2112/auroraemeteors_boardman_1080.jpg';){mtitle title="冰岛上空的流星和极光"/}Image Credit & Copyright: James Boardman-Woodend; Annotation: Judy Schmidt说明: 那座火山后方发生了什么事?很多。首先,Kirkjufell火山是座位在冰岛西侧Grundarfjörður镇附近的老火山。它陡峭的山体前方有个峡湾,2012年12月中拍照时,它刚开始结冰。虽然在肉眼里,背景的极光极为暗淡,然而在这幅25秒长曝光影像里,极光变得色彩缤纷且明亮。但这幅影像最特殊的在于:它同时也补捉到来自双子流星雨的流星迹;如果极光更亮的话,这些流星可能就不会这么醒目。影像左侧遥远的背景中,可见到我们银河的带状盘面,前方则散布着众多位在我们附近的恒星。今年的双子 流星 雨之极大期就在今晚,届时或许能为星空爱好者带来难以忘怀的视觉享宴。{lamp/}原文:{mtitle title="Meteors and Auroras over Iceland"/}Image Credit & Copyright: James Boardman-Woodend; Annotation: Judy SchmidtExplanation: What's going on behind that mountain?Quite a bit. First of all, the mountain itself, named Kirkjufell, is quite old and located in western Iceland near the town of Grundarfjörður. In front of the steeply-sloped structure lies a fjord that had just begun to freeze when the above image was taken -- in mid-December of 2012.Although quite faint to the unaided eye, the beautiful colors of background aurorae became quite apparent on the 25-second exposure.What makes this image of particular note, though, is that it also captures streaks from the Geminids meteor shower -- meteors that might not have been evident were the aurora much brighter.Far in the distance, on the left, is the band of our Milky Way Galaxy, while stars from our local part of the Milky Way appear spread across the background. Tonight the Geminids meteor shower peaks again and may well provide sky enthusiasts with their own memorable visual experiences.
2021年12月13日
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2021-11-21
2021年11月21日:李奥纳德彗星-(Introducing Comet Leonard)
2021年11月21日:李奥纳德彗星-(Introducing Comet Leonard)--原图下载{mtitle title="李奥纳德彗星"/}Image Credit & Copyright: Dan Bartlett说明: 李奥纳德彗星来了。在2021年1月发现李奥纳德彗星(C/2021 A1 Leonard)之时,它只是火星轨道外头的一团暗淡光斑。不过这颗庞大蒸腾的冰球,将顺着它的轨道来到太阳系内围,在今年12月通过地球和金星附近,然后在2022年1月初旋绕过太阳。虽然彗星是以难以预测着称,不过仍有人预言李奥纳德彗星会持续增亮,并在12月成为肉眼可见的彗星。在上面这幅摄于1个多星期前的影像里,李奥纳德彗星已然有泛绿的彗发,并曳着宽广的尘尾。这幅主题影像,是由1部中口径望远镜拍摄的62幅照片组合而成;其中部分照片是以彗星为导星,其它用于记录背景恒星。影像则摄于美国.加州.六月湖附近的东内华达山脉之幽暗天空下。在12月中旬通过地球附近之后,这颗彗星会从北天移入南天。{lamp/}原文:{mtitle title="Introducing Comet Leonard"/}Image Credit & Copyright: Dan BartlettExplanation: Here comes Comet Leonard.Comet C/2021 A1 (Leonard) was discovered as a faint smudge in January 2021 when it was out past Mars -- but its orbit will take the giant shedding ice-ball into the inner Solar System, passing near both Earth and Venus in December before it swoops around the Sun in early January 2022.Although comets are notoriously hard to predict, some estimations have Comet Leonard brightening to become visible to theunaided eye in December. Comet Leonard was captured just over a week ago already sporting a green-tinged coma and an extended dust tail.The featured picture was composed from 62 images taken through a moderate-sized telescope -- one set of exposures tracking the comet, while another set tracking the background stars.The exposures were taken from the dark skies above the Eastern Sierras (Mountains), near June Lake in California, USA. Soon after passing near the Earth in mid-December, the comet will shift from northern to southern skies.
2021年11月21日
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