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.

2023年10月10日:韦伯影像：藏在猎户大星云里的天体-（Hidden Orion from Webb） [2023年10月10日:韦伯影像：藏在猎户大星云里的天体-（Hidden Orion from Webb）--原图下载](https://apod.nasa.gov/apod/image/2310/OrionNircShort_Webb_2048.jpg"onMouseOver="if (document.images)document.imagename1.src='image/2310/OrionNircLong_Webb_960.jpg';"onMouseOut="if (document.images)document.imagename1.src='image/2310/OrionNircShort_Webb_960.jpg';){mtitle title="韦伯影像：藏在猎户大星云里的天体"/}Image Credit & License: NASA, ESA, CSA, JWST; Processing: M. McCaughrean & S. Pearson说明: 猎户大星云内有隐不可见的恒星。在只能感侧可见光的肉眼里，它看起来像是猎户座内的弥漫小光斑。不过，这幅来自韦伯太空望远镜的代表色影像，是由摄于红光和近红外光的数据组合而成。因此它无比清晰的证实，猎户大星云是个由年轻恒星、炽热气体和黝黑尘埃织就的忙碌区域。而轮替影像所呈现的，则是同一区域在更长波长的近红外光之代表色影像。驱动猎户大星云（M42）的主要能量源，是位在星云中心的那群亮星所属的四边形星团。而这些亮星周围的弥漫丝缕状晕光，主成分是受热的星际尘埃。在仔细检枧这些影像之后，出乎意外的找到大量木星质量级的双天体系统（JuMBOs），而这些成对的双木系统，或许能为了解恒星到底是如何形成的提供线索。此外，包括马头星云在内的整个猎户大星云複合体，于未来的数百万年里会缓缓的消散匿蹤。{lamp/}原文：{mtitle title="Hidden Orion from Webb"/}Image Credit & License: NASA, ESA, CSA, JWST; Processing: M. McCaughrean & S. PearsonExplanation: The Great Nebula in Orion has hidden stars. To the unaided eye in visible light, it appears as a smallfuzzy patch in the constellation of Orion.But this image was taken by the Webb Space Telescope in a representative-color composite of red and very near infrared light. It confirms with impressive detail that the Orion Nebula is a busy neighborhood of young stars, hot gas, and dark dust. The rollover image shows the same image in representative colors further into the near infrared.The power behind much of the Orion Nebula (M42) is the Trapezium - a cluster of bright stars near the nebula's center. The diffuse and filamentary glow surrounding the bright stars is mostly heated interstellar dust. Detailed inspection of these images shows an unexpectedly large number of Jupiter-Mass Binary Objects (JuMBOs), pairs of Jupiter-mass objects which might give a clue to how stars are forming. The whole Orion Nebula cloud complex, which includes the Horsehead Nebula, will slowly disperse over the next few million years.

2023年09月26日:IC 4592：蓝马头反射星云-（IC 4592: The Blue Horsehead Reflection Nebula） 2023年09月26日:IC 4592：蓝马头反射星云-（IC 4592: The Blue Horsehead Reflection Nebula）--原图下载{mtitle title="IC 4592：蓝马头反射星云"/}Image Credit & Copyright: Antoine & Dalia Grelin说明: 你看到马头了吗？你见到的不是猎户座着名的马头星云，而是另一个只有在较深空影像里，形似马头的外观才会显现的昏暗星云。这张影像所呈现的分子云複合体的主体，是编录号为IC 4592的反射星云。反射星云是由微小的尘埃所组成，正常情况下看起来很黝黑，不过如果它反射附近炽热恒星的可见光，色泽却可能变得很蓝。在上面这个案例里，大部分受到反射的星光，是源自位于马 眼的恒星。 这颗恒星是尾宿九（Nu Scorpii）的成员星之一，而尾宿九则是天蝎座数个明亮多合星系统之一。在影像的中右方，可以看见环拱着2颗恒星、名为IC 4601的第二个反射星云。{lamp/}原文：{mtitle title="IC 4592: The Blue Horsehead Reflection Nebula"/}Image Credit & Copyright: Antoine & Dalia GrelinExplanation: Do you see the horse's head? What you are seeing is not the famous Horsehead nebula toward Orion, but rather a fainter nebula that only takes on a familiar form with deeper imaging. The main part of the here-imaged molecular cloud complex is reflection nebula IC 4592. Reflection nebulas are made up of very fine dust that normally appears dark but can look quite blue when reflecting the visible light of energetic nearby stars. In this case, the source of much of the reflected light is a star at the eye of the horse. That star is part of Nu Scorpii, one of the brighter star systems toward the constellation of the Scorpion (Scorpius). A second reflection nebula dubbed IC 4601 is visible surrounding two stars above and to the right of the image center.

2022年12月29日:马头与火焰星云-（Horsehead and Flame） 2022年12月29日:马头与火焰星云-（Horsehead and Flame）--原图下载{mtitle title="马头与火焰星云"/}Image Credit &Copyright:Jason Close说明: 在这幅清晰星空影像里，明亮背景发射星云上的黝黑暗斑，是亦名为巴纳德33的着名马头星云。位于猎户座方向约1,500光年远处的马头星云，高度在5光年左右。在此区富饶分子云複合体内的这大片不透光尘埃，从银河系我们所在的位置看出去，恰好拥有我们很熟悉的形状。影像中左方的亮星，则是猎户腰带最东侧的参宿一。来自参宿一的高能紫外光，更激发其下方满是尘埃的NGC 2024（火焰星云）发出明亮的辉光。完善这个色泽对比範例的天体，还有马头星云下方的泛蓝反射星云NGC 2023。这片取景佳妙的望远镜视野，大约涵盖了3个满月宽度的天区。{lamp/}原文：{mtitle title="Horsehead and Flame"/}Image Credit &Copyright:Jason CloseExplanation: The Horsehead Nebula,famous celestialdark marking also known as Barnard 33,is notched against a background glow of emission nebulae inthis sharp cosmic skyscape.About five light-years "tall" the Horsehead lies some 1,500 light-years away in the constellation of Orion.Within the region's fertile molecular cloud complex,the expanse of obscuring dust has a recognizable shape onlyby chance fromour perspectivein theMilky Waythough.Orion's easternmost belt star, bright Alnitak,is to the left of center. Energetic ultraviolet light fromAlnitak powers the glow ofdusty NGC 2024, the Flame Nebula, just below it.Completing a study in cosmic contrasts, bluish reflectionnebula NGC 2023 is below the Horsehead itself.This well-framed telescopic field spans about 3 full moons onthe sky.

2022年11月28日:穿过猎户座的狮子流星-（Leonid Meteors Through Orion） [2022年11月28日:穿过猎户座的狮子流星-（Leonid Meteors Through Orion）--原图下载](https://apod.nasa.gov/apod/image/2211/Leonids2022_Hongyang_2880.jpg"onMouseOver="if (document.images)document.imagename1.src='image/2211/Leonids2022_Hongyang_960_annotated.jpg';"onMouseOut="if (document.images)document.imagename1.src='image/2211/Leonids2022_Hongyang_960.jpg';){mtitle title="穿过猎户座的狮子流星"/}Image Credit & Copyright: Luo Hongyang说明: 下一颗流星会出现在何处？纵然在流星雨期间，这也几乎是难以预知。因此，要观赏流星雨的好方法，就是找一个能舒适的坐下并监控大片幽暗天空的地点。尤其是能与朋友共享这种体验，会令人更加满足。这幅影像所呈现的流星雨，是在本月稍早达到极大期的2022年狮子流星雨，观测点从中国．海南省俯瞰南中国海。而影像则是由数小时期间所捕获并隔离出来的流星痕，与及稍早拍摄的前景影像叠加而成。在此时及此地，可以看到可回溯到狮子座的狮子流星，滑过了猎户座和其他星座。影像中，还可见到明亮泛红的火星出现在影像顶部附近。影像中的这二位流星爱好者，因为对天文学的热爱而结识、结縭，并在本月欢庆他们共同的生日。{lamp/}原文：{mtitle title="Leonid Meteors Through Orion"/}Image Credit & Copyright: Luo HongyangExplanation: Where will the next meteor appear?Even during a meteor shower, it is practically impossible to know.Therefore, a good way to enjoy a meteor shower is to find a place where you can sit comfortably and monitor a great expanse of dark sky.And it may be satisfying to share this experience with a friend. The meteor shower depicted was the 2022 Leonids which peaked earlier this month, and the view is from Hainan, China looking out over the South China Sea.Meteor streaks captured over a few hours were isolated and added to a foreground image recorded earlier. From this place and time, Leonid meteors that trace back to the constellation of Leo were seen streaking across other constellations including Orion.The bright red planet Mars appears near the top of the image.Bonding over their love of astronomy, the two pictured meteor enthusiasts, shown celebrating their common birthday this month, are now married.

2022年03月12日:雷耶斯角上空的银河-（Point Reyes Milky Way） 2022年03月12日:雷耶斯角上空的银河-（Point Reyes Milky Way）--原图下载{mtitle title="雷耶斯角上空的银河"/}Image Credit &Copyright:Dan Zafra说明: 在这片从地球加州海岸的雷耶斯角看向太平洋的夜空景观中，北天冬季星座和银河系的长长盘弧落向太平洋。大犬座最明亮的天狼星，是在银河恒星拱下方很吸睛的天体。猎户座泛黄的参宿四．金牛座的毕宿五．及泛蓝的昴宿星团 ，也出现在银河及西北地平线之间，靠近影像的中心附近。用于构建这张全景图的多张照星云照片，则是在今年3 月初所拍摄的；这些星云都是极为昏暗，肉眼不得见的天体。在那个北半球的夜晚， 出现在天空中、幅员广阔的辉光天体，还包括猎户座里半圆形的泛红巴纳德环、以及昴 宿星团右上方、亦称为加州星云的NGC 1499。{lamp/}原文：{mtitle title="Point Reyes Milky Way"/}Image Credit &Copyright:Dan ZafraExplanation: Northern winterconstellations and a long arc of the Milky Wayare setting in this night skyscape looking toward the Pacific Ocean fromPoint Reyes onplanet Earth'sCalifornia coast.Sirius, alpha star of Canis Major, is prominent below the starry arctoward the left.Orion's yellowishBetelgeuse, Aldebaran in Taurus, and the blue tintedPleiades star clusteralso find themselves betweenMilky Way and northwestern horizon near the center of the scene.The nebulae visible in the series of exposures used to constructthis panoramic view were captured in early March,but are just too faint to be seen with the unaided eye.On that northern night theirexpansive glow includesthe reddish semi-circle of Barnard's Loopin Orion andNGC 1499 above and right of the Pleiades, also known as theCalifornia Nebula.