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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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2020-05-11
2020年05月11日:参宿四的后方-(Behind Betelgeuse)
2020年05月11日:参宿四的后方-(Behind Betelgeuse)--原图下载{mtitle title="参宿四的后方"/}Image Credit & Copyright: Adam Block,Steward Observatory,University of Arizona说明: 参宿四的后方有什么?位在天空着名猎户座方向的红超巨星参宿四,是地球天空中较明亮和行为较怪异的恒星之一。其实,参宿四位在猎户座许多亮星的前方,也在更广袤的猎户分子云複合体的前方。量化来说,光从参宿四传到我们这里大约走上700光年,从猎户大星云及周围的尘埃和气体传过来,大约要用1,300年。除了最大型的望远镜之外,在其他的望远镜里,see 参宿四只是个光点,不过因为望远镜和地球大气 天生的散焦作用,在影像里它晕成圆碟状。在上面这幅长曝光主题影像里,在参宿四的后方,可见到数以千计的银河背景恒星、猎户分子云内的黝黑尘埃、以及位在更远的觜宿一环状星云边缘的氢气之泛红辐射。参宿四已从过去6个月中的不寻常变暗现象里复原,不过,它还是预期会在接下来的100,000年内,发生壮观的超新星爆炸。{lamp/}原文:{mtitle title="Behind Betelgeuse"/}Image Credit & Copyright: Adam Block,Steward Observatory,University of ArizonaExplanation: What's behind Betelgeuse?One of the brighter and more unusual stars in the sky, the red supergiant star Betelgeuse can be found in the direction of famous constellation Orion.Betelgeuse, however, is actually well in front of many of the constellation's other bright stars, and also in front of the greater Orion Molecular Cloud Complex. Numerically, light takes about 700 years to reach us from Betelgeuse, but about 1,300 years to reach us from the Orion Nebula and its surrounding dust and gas. All but the largest telescopes see Betelgeuse as only a point of light, but a point so bright that the inherent blurriness created by the telescope and Earth's atmosphere make it seem extended. In the featured long-exposure image, thousands of stars in our Milky Way Galaxy can be seen in the background behind Betelgeuse, as well as dark dust from the Orion Molecular Cloud, and some red-glowing emission from hydrogen gas on the outskirts of the more distant Lambda Orionis Ring.Betelgeuse has recovered from appearing unusually dim over the past six months, but is still expected to explode in a spectacular supernova sometime in the next (about) 100,000 years.
2020年05月11日
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2020-03-29
2020年03月29日:212小时长曝光的猎户座-(A 212-Hour Exposure of Orion)
[2020年03月29日:212小时长曝光的猎户座-(A 212-Hour Exposure of Orion)--原图下载](https://apod.nasa.gov/apod/image/1511/Orion212_Volskiy_5574.jpg"onMouseOver="if (document.images)document.imagename1.src='image/1511/Orion212_Volskiy_960_annotated.jpg';"onMouseOut="if (document.images)document.imagename1.src='image/1511/Orion212_Volskiy_960.jpg';){mtitle title="212小时长曝光的猎户座"/}Image Credit & Copyright: Stanislav Volskiy, Rollover Annotation: Judy Schmidt说明: 猎户座远远多于排成一列的腰带三星,而那个方向的天空更是美丽星云群聚之处。为了对这片天空有更深入的认识,在2013年和2014年的多个清朗的夜晚,特地执行了一次超长曝光摄影计画。在经过212小时的相机拍摄与及接下来一整年的影像处理之后,终于製成这张集合1400幅照片、涵盖了40倍满月 视张角的主题影像。在众多可见的细緻景物里,朝着影像中下方伸展的明亮圆弧状巴纳德圈,是其中最吸睛的天体之一。然而,照片顶端的庞大泛红星云并非蔷薇星云,而是声名不显的觜宿一星云,蔷薇星云则是位在影像左上角的红白间杂星云。照片中央之上的橘红亮星是参宿四,右下角的明亮泛蓝恒星是参宿七。其他可见的着名天体还有:女巫头星云、火焰星云、狐皮星云,以及如果你知道该往何处找的话─小小的马头星云。至于猎户腰部的腰带三星,在这幅忙碌影像并不好认,不过明眼人还是可以 在影像的中下方找到它们。(Lambda Orionis 觜宿一星云){lamp/}原文:{mtitle title="A 212-Hour Exposure of Orion"/}Image Credit & Copyright: Stanislav Volskiy, Rollover Annotation: Judy SchmidtExplanation: The constellation of Orion is much more than three stars in a row.It is a direction in space that is rich with impressive nebulas.To better appreciate this well-known swath of sky, an extremely long exposure was taken over many clear nights in 2013 and 2014.After 212 hours of camera time and an additional year of processing, the featured 1400-exposure collage spanning over 40 times the angular diameter of the Moon emerged. Of the many interesting details that have become visible, one that particularly draws the eye is Barnard's Loop, the bright red circular filament arcing down from the middle.The Rosette Nebula is not the giant red nebula near the top of the image -- that is a larger but lesser known nebula known as Lambda Orionis. The Rosette Nebula is visible, though: it is the red and white nebula on the upper left. The bright orange star just above the frame center is Betelgeuse, while the bright blue star on the lower right is Rigel.Other famous nebulas visible include the Witch Head Nebula, the Flame Nebula, the Fox Fur Nebula, and, if you know just where to look, the comparatively small Horsehead Nebula.About those famous three stars that cross the belt of Orion the Hunter -- in this busy frame they can be hard to locate, but a discerning eye will find them just below and to the right of the image center.
2020年03月29日
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2020-02-18
2020年02月18日:中波希米亚高地上空的猎户座-(Orion over the Central Bohemian Highlands)
[2020年02月18日:中波希米亚高地上空的猎户座-(Orion over the Central Bohemian Highlands)--原图下载](https://apod.nasa.gov/apod/image/2002/OrionOverCzech_Bauer_7954.jpg"onMouseOver="if (document.images)document.imagename1.src='image/2002/OrionOverCzech_Bauer_960_annotated.jpg';"onMouseOut="if (document.images)document.imagename1.src='image/2002/OrionOverCzech_Bauer_960.jpg';){mtitle title="中波希米亚高地上空的猎户座"/}Image Credit & Copyright: Vojtěch Bauer说明: 这个星座你认得吗?落向捷克.中波希米亚高地后方的是猎户座,它是天空最容易辨认的星群之一,也是3万多年来,人们最熟悉的星座。猎户座在过去5万年形状基本不变,而在未来的数千年之中,也会是如此。在每年的这段期间,醒目的猎户座在日落时,会高悬在天空中,标誌现在是地球北半球的冬季和南半球的夏天。这幅主题影像,是由上个月某晚在相同地点拍摄的30多张照片组合而成。影像中,位在猎户腰带三星左下附近的是猎户大星云,而环拱腰带三星的4颗亮星,顺时针方向从左开始,分别是泛蓝的天狼(Sirius)、目前异常昏暗的橙红参宿四(上)、毕宿五(右缘附近)、和参宿七(下)。接下来随着时间一週一週的过去,猎户座会越来越早西沈。{lamp/}原文:{mtitle title="Orion over the Central Bohemian Highlands"/}Image Credit & Copyright: Vojtěch BauerExplanation: Do you recognize this constellation?Setting past the Central Bohemian Highlands in the Czech Republicis Orion, one of the most identifiable star groupings on the sky and an icon familiar to humanity for over 30,000 years.Orion has looked pretty much the same during this time and should continue to look the same for many thousands of years into the future. Prominent Orion is high in the sky at sunset this time of year, a recurring sign of (modern) winter in Earth's northern hemisphere and summer in the south.The featured picture is a composite of over thirty images taken from the same location and during the same night last month. Below and slightly to the left of Orion's three-star belt is the Orion Nebula, while four of the bright stars surrounding the belt are, clockwise, Sirius (far left, blue), Betelgeuse (top, orange, unusually faint), Aldebaran (far right), and Rigel (below).As future weeks progress, Orion will set increasingly earlier.
2020年02月18日
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2020-02-17
2020年02月17日:参宿四的表面变化-(The Changing Surface of Fading Betelgeuse)
2020年02月17日:参宿四的表面变化-(The Changing Surface of Fading Betelgeuse)--原图下载{mtitle title="参宿四的表面变化"/}Image Credit: ESO, M. Montargès et al.说明: 参宿四除了变暗之外,它的外观也有改变吗?的确有。这颗猎户座的着名红超巨星极为庞大,就连地面望远镜都能勉强解析出它的表面。这二幅由欧南天文台.极大望远镜拍摄的主题影像,呈现了这颗恒星在去年初和年底的样貌。左侧的影像显示,年初时参宿四的亮度远较年底时均匀,而右侧的影像显示,年底时参宿四下半部比上半部暗很多。此外,去年头五个月的业余观测指出,参宿四的亮度反而稍有增加,不过它在年底的最后五个月却突然大幅变暗。对这颗着名超巨变星来说,这种变化可能只是正常行为,然而最近的变暗,却重新炒热关于参宿四何时会发生超新星爆炸的讨论。因为参宿四离我们约700光年远,这个可能发生在数千年后的超新星事件,届时对地球上的生命并无威胁,可能只是夜空的奇景而已。{lamp/}原文:{mtitle title="The Changing Surface of Fading Betelgeuse"/}Image Credit: ESO, M. Montargès et al.Explanation: Besides fading, is Betelgeuse changing its appearance?Yes.The famous red supergiant star in the familiar constellation of Orion is so large that telescopes on Earth can actually resolve its surface -- although just barely.The two featured images taken with the European Southern Observatory's Very Large Telescope show how the star's surface appeared during the beginning and end of last year. The earlier image shows Betelgeuse having a much more uniform brightness than the later one, while the lower half of Betelgeuse became significantly dimmer than the top.Now during the first five months of 2019 amateur observations show Betelgeuse actually got slightly brighter, while in the last five months the star dimmed dramatically.Such variability is likely just normal behavior for this famously variable supergiant, but the recent dimming has rekindled discussion on how long it may be before Betelgeuse does go supernova.Since Betelgeuse is about 700 light years away, its eventual supernova -- probably thousands of years in the future -- will likely be an amazing night-sky spectacle, but will not endanger life on Earth.
2020年02月17日
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2020-01-20
2020年01月20日:掠过猎户座的象限仪流星-(Quadrantid Meteors through Orion)
[2020年01月20日:掠过猎户座的象限仪流星-(Quadrantid Meteors through Orion)--原图下载](https://apod.nasa.gov/apod/image/2001/QuadrantidsOrion_Horalek_1500.jpg"onMouseOver="if (document.images)document.imagename1.src='image/2001/QuadrantidsOrion_Horalek_960_annotated.jpg';"onMouseOut="if (document.images)document.imagename1.src='image/2001/QuadrantidsOrion_Horalek_960.jpg';){mtitle title="掠过猎户座的象限仪流星"/}Image Credit & Copyright: PetrHorálek说明: 这些流星迹为何近乎平行?因为它们都来自同一颗太空巨岩,所以都可以回溯到在天空同一方向的象限仪流星雨 辐射点。这个方向在以前的象限仪座之内,故这个事件称为象限仪[座]流星雨,不过当国际天文联盟1922年在重划现代星座时,这个星座并未列名其中。虽然现在这群流星雨的源头在牧夫座内,不过大家仍然延用旧名。不论名称为何,每年的1月当地球穿过这道尘埃流时,这些尘埃微粒就进入地球大气,被加热到极高的温度成为明亮的流星。这幅摄于1月4日的组合主题影像,前景为斯洛伐克的美丽雪景,背景则有以猎户座为主的深空景观。其中,泛红的参宿四出奇昏暗,而天文学家在过去数个月里,一直在监控它变暗的历程。{lamp/}原文:{mtitle title="Quadrantid Meteors through Orion"/}Image Credit & Copyright: PetrHorálekExplanation: Why are these meteor trails nearly parallel?Because they were all shed by the same space rock and so can be traced back to the same direction on the sky: the radiant of the Quadrantid Meteor Shower. This direction used to be toward the old constellation of Quadrans Muralis, hence the name Quadrantids, but when the International Astronomical Union formulated its list of modern constellations in 1922, this constellation did not make the list.Even though the meteors are now considered to originate from the recognized constellation of Bootes, the old name stuck.Regardless of the designation, every January the Earth moves through a dust stream and bits of this dust glow as meteors as they heat up in Earth's atmosphere. The featured image composite was taken on January 4 with a picturesque snowy Slovakian landscape in the foreground, and a deep-exposure sky prominently featuring the constellation Orion in the background.The red star Betelgeuse appears unusually dim -- its fading over the past few months is being tracked by astronomers.
2020年01月20日
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2019-09-30
2019年09月30日:巴西上空的猎户座-(Orion Rising over Brazil)
2019年09月30日:巴西上空的猎户座-(Orion Rising over Brazil)--原图下载{mtitle title="巴西上空的猎户座"/}Image Credit &Copyright: Carlos Fairbairn说明: 你最近看过猎户座吗?在接下来这数个月的夜晚,猎户座将越来越早升起,所以将是观赏这个熟悉星座的最佳时机。不过在肉眼里,不要预期猎户座的群星和星云,色彩会如这幅精采相机影像这么缤纷。在这幅上个月用相机摄于巴西.中西区的猎户座全彩影像里,位在左侧最明亮的低温红巨星参宿四为亮橙色。而猎户座数量众多的炽热泛蓝恒星之中,超巨星参宿七在右上角,参宿五在左上角,参宿六在右下角。排成猎户腰带的三颗恒星之中,由下到上分别是参宿一、 参宿二及参宿三。它们诞生于猎户座广被探索的星际云之内,距离都在1,500光年左右。如果你发现位在右上角猎户配剑上的一颗"星",看起偏红而且弥漫,这并非你眼花。它正是有猎户座大星云令名的恒星形成区。{lamp/}原文:{mtitle title="Orion Rising over Brazil"/}Image Credit &Copyright: Carlos FairbairnExplanation: Have you seen Orion lately?The next few months will be the best for seeing this familiar constellation as it rises continually earlier in the night. However, Orion's stars andnebulas won't lookquite as colorful to the eye as they do in this fantastic camera image.In the featured image, Orion was captured by camera showing its full colors last month over a Brazilian copal tree from Brazil's Central-West Region.Here the cool red giantBetelgeusetakes on a strong orange hue as the brightest star on the far left.Otherwise, Orion's hot blue stars are numerous, withsupergiant Rigel balancing Betelgeuse at the upper right, Bellatrix at the upper left, andSaiph at the lower right.Lined up in Orion's belt (bottom to top) areAlnitak, Alnilam, and Mintaka all about 1,500 light-years away, born of the constellation's well studiedinterstellar clouds.And if a "star" toward the upper right Orion's sword looks reddish and fuzzy to you, it should.It's the stellar nursery known as the Great Nebula of Orion.
2019年09月30日
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