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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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2023-08-09
2023年08月09日:英仙流星雨-(Meteor Shower: Perseids from Perseus)
2023年08月09日:英仙流星雨-(Meteor Shower: Perseids from Perseus)--原图下载{mtitle title="英仙流星雨"/}Credit & Copyright: Petr Horálek /Institute of Physics in Opava说明: 这星期是观赏流星的好时机。因为年年复现的英仙流星雨之极大期就落在这星期,届时来自彗星的尘埃将洒落地球,曳着滑过幽暗长空的光痕。这幅组合主题影像,是在2018年摄于斯洛伐克的波隆尼暗空公园,前景则是隶属于柯罗尼卡天文台的望远镜。虽然彗星的尘埃微粒彼此平行运动,但它们所形成的流星看似皆源自同名的英仙座天空之辐射点。这是因为透视所产生的辐散效应,让原来像火车轨道的平行轨迹,看似会聚在远方。今年的英仙流星雨的极大期,预期将落在星期六的子夜过后。由于当晚的蛾眉残月会较晚升起,万里无云的天空将比平时更幽暗,因此今年有机会看到大量昏暗的流星。{lamp/}原文:{mtitle title="Meteor Shower: Perseids from Perseus"/}Credit & Copyright: Petr Horálek /Institute of Physics in OpavaExplanation: This is a good week to see meteors. Comet dust will rain down on planet Earth, streaking through dark skies during peak nights of the annual Perseid Meteor Shower. The featured composite image was taken during the 2018 Perseids from the Poloniny Dark Sky Park in Slovakia. The dome of the observatory in the foreground is on the grounds of Kolonica Observatory.Although the comet dust particles travel parallel to each other, the resulting shower meteors clearly seem to radiate from a single point on the sky in the eponymous constellation Perseus. The radiant effect is due to perspective, as the parallel tracks appear to converge at a distance, like train tracks. The Perseid Meteor Shower is expected to reach its highest peak on Saturday after midnight. Since a crescent Moon will rise only very late that night, cloudless skies will be darker than usual, making a high number of faint meteors potentially visible this year.
2023年08月09日
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2023-07-24
2023年07月24日:流星解体时的元素发光-(Chemicals Glow as a Meteor Disintegrates)
2023年07月24日:流星解体时的元素发光-(Chemicals Glow as a Meteor Disintegrates)--原图下载{mtitle title="流星解体时的元素发光"/}Image Credit & Copyright: Michael Kleinburger说明: 流星的色彩可以很缤纷。虽然人类的眼睛无法分办太多色彩,但相机通常可以。这幅影像里的火流星,据摄影者之言,不但是他此生所见最明亮的流星,而其色彩更是无比缤纷。于今年7月中旬,在奥地利.霍赫卡山设定相机要拍摄我们银河系的中央盘面时,摄影者意外捕捉到这颗流星。这颗发光的小碎片,可能是很久之前碎裂自彗星或小流星,然后不幸闯入了地球的大气层。流星的色彩通常来自流星解体时所释放的电离元素,蓝绿色泽的光通常来自镁、紫光来自钙、而绿光源自镍。不过,红光则通常是由地球大气中的激发态氮和氧所发出的。这颗转瞬即逝的火 流星持续不到1秒,然而它在风中飘飞的电离流星痕,可见的期间绵延了将近1分钟。{lamp/}原文:{mtitle title="Chemicals Glow as a Meteor Disintegrates"/}Image Credit & Copyright: Michael KleinburgerExplanation: Meteors can be colorful.While the human eye usually cannot discern many colors, cameras often can.Pictured here is a fireball, a disintegrating meteor that was not only one of the brightest the photographer has ever seen, but colorful.The meteor was captured by chance in mid-July with a camera set up on Hochkar Mountain in Austria to photograph the central band of our Milky Way galaxy.The radiant grit, likely cast off by a comet or asteroid long ago, had the misfortune to enter Earth's atmosphere. Colors in meteors usually originate from ionized chemical elements released as the meteor disintegrates, with blue-green typically originating from magnesium, calcium radiating violet, and nickel glowing green.Red, however, typically originates from energized nitrogen and oxygen in the Earth's atmosphere. This bright meteoric fireball was gone in a flash -- less than a second -- but it left a wind-blown ionization trail that remained visible for almost a minute.
2023年07月24日
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2023-07-16
2023年07月16日:阿尔卑斯山上空的流星与银河-(Meteor and Milky Way over the Alps)
2023年07月16日:阿尔卑斯山上空的流星与银河-(Meteor and Milky Way over the Alps)--原图下载{mtitle title="阿尔卑斯山上空的流星与银河"/}Image Credit & Copyright: Nicholas Roemmelt(Venture Photography)说明: 这是一片扣人心弦的景观。站在阿尔卑斯山脉的Tschirgant峰,你不仅能见到附近的城镇和远处的泰罗宁连峰,天气良好的话,还可看到星星、星云、及银河系的中央盘面。然而在这一晚,让艰辛的攀登过程得到满满回报的,则是2018年 英仙座 流星 雨的极大期也在这晚。也正如所祈愿的,消散的云层让美丽的星空景观得以显现出来,其中包括许多昏暗的流星,而一部摆放位置经过仔细规划的相机,就此拍下了一系列的影像。然后,一颗明亮 色彩多变的流星闪现在竖直的银河盘面右方,并往下飞掠。 很幸运的,这部相机也捕捉到这个景象。 因此,摄影者马上又拍了另一张有观星人伫立在邻近峰顶的照片。回来后,再借助数位技术把这些影像全都整合在一起。{lamp/}原文:{mtitle title="Meteor and Milky Way over the Alps"/}Image Credit & Copyright: Nicholas Roemmelt(Venture Photography)Explanation: Now this was a view with a thrill.From Mount Tschirgant in the Alps, you can see not only nearby towns and distant Tyrolean peaks, but also, weather permitting, stars, nebulas, and the band of the Milky Way Galaxy.What made the arduous climb worthwhile this night, though, was another peak -- the peak of the 2018 Perseids Meteor Shower.As hoped, dispersing clouds allowed a picturesque sky-gazing session that included many faint meteors, all while a carefully positioned camera took a series of exposures.Suddenly, a thrilling meteor -- bright and colorful -- slashed down right next to the nearly vertical band of the Milky Way. As luck would have it, the camera caught it too. Therefore, a new image in the series was quickly taken with one of the sky-gazers posing on the nearby peak.Later, all of the images were digitally combined.
2023年07月16日
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2022-12-13
2022年12月13日:罗弗敦群岛的美妙天空-(An Artful Sky over Lofoten Islands)
[2022年12月13日:罗弗敦群岛的美妙天空-(An Artful Sky over Lofoten Islands)--原图下载](https://apod.nasa.gov/apod/image/2212/SkyArt_Cobianchi_2048.jpg"onMouseOver="if (document.images)document.imagename1.src='image/2212/SkyArt_Cobianchi_1024_annotated.jpg';"onMouseOut="if (document.images)document.imagename1.src='image/2212/SkyArt_Cobianchi_1024.jpg';){mtitle title="罗弗敦群岛的美妙天空"/}Image Credit & Copyright: Giulio Cobianchi说明: 夜空能否能兼具科学性与艺术性?如果可以,那这幅主题影像或许可为例证之一。这幅数位合成全景图,是由10张地景与10张天空照片组合而成,所有这些照片皆是由同一部相机摄于同一晚与同一地点。影像里的标誌性结构,经过特别处理加以增亮,而地景也很巧妙的予以照光。在二个月前拍摄的这幅富有创意之影像里,前景为作为影像定锚的摄影者,手执着灯照亮了这片挪威.罗弗敦群岛令人讚叹的崎岖地貌。远方则可见的三个吸睛的光弧之中,分别为左侧的银河系,以及右侧科学意涵有些不寻常的双弧极光。它们之间更夹着一颗流星。而从左到右,其他值得关注的天体有:仙女大星系、木星、织女星、以及构成北斗七星这个星官的群星。{lamp/}原文:{mtitle title="An Artful Sky over Lofoten Islands"/}Image Credit & Copyright: Giulio CobianchiExplanation: Can the night sky be both art and science?If so, perhaps the featured image is an example.The digital panorama was composed of 10 landscape and 10 sky images all taken on the same night, from the same location, and with the same camera. Iconic features in the image have been artfully brightened, and the ground nearby was artfully illuminated.Visible in the foreground is the creative photographer anchoring an amazing view from the rugged Lofoten Islands of Norway, two months ago, by holding a lamp.Far in the distance are three prominent arches: our Milky Way Galaxy on the left, while a scientifically-unusual double-arced aurora is documented on the right.A meteor is highlighted between them.Other notable skylights include, left to right, the Andromeda Galaxy, the planet Jupiter, the star Vega, and the stars that compose the Big Dipper asterism.
2022年12月13日
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2022-08-07
2022年08月07日:星系前方的流星-(Meteor before Galaxy)
2022年08月07日:星系前方的流星-(Meteor before Galaxy)--原图下载{mtitle title="星系前方的流星"/}Image Credit & Copyright: FritzHelmut Hemmerich说明: 仙女座大星系前方的泛绿光痕是什么?一颗流星。于2016年拍摄仙女大星系之时,适逢英仙 流星 雨极大期左右,突现一颗来自外太空的小沙岩,掠过我们银河系遥远伴星系之正前方。这颗小流星,只用了极短的时间就通过这片宽10度的视野。在进入地球大气之后,剧烈减速的这颗流星发生数次爆发。这颗流星汽化后所产生明亮气体,其泛绿的色泽可能是源自镍。虽然这幅影像的曝光设定是为了拍摄英仙流星,然而依所拍到的流星之指向来判断,它较可能是极大期在数星期之前的宝瓶座δ南 流星雨之流星。 今年的英仙流星雨极大期落在这个週末,只不过,今年的流星得与近满相明月所照亮的夜空争辉。{lamp/}原文:{mtitle title="Meteor before Galaxy"/}Image Credit & Copyright: FritzHelmut HemmerichExplanation: What's that green streak in front of the Andromeda galaxy?A meteor.While photographing the Andromeda galaxy in 2016, near the peak of the Perseid Meteor Shower, a small pebble from deep space crossed right in front of our Milky Way Galaxy's far-distant companion.The small meteor took only a fraction of a second to pass through this 10-degree field. The meteor flared several times while braking violently upon entering Earth's atmosphere. The green color was created, at least in part, by the meteor's gas glowing as it vaporized.Although the exposure was timed to catch a Perseid meteor, the orientation of the imaged streak seems a better match to a meteor from the Southern Delta Aquariids, a meteor shower that peaked a few weeks earlier. Not coincidentally, the Perseid Meteor Shower peaks later this week, although this year the meteors will have to outshine a sky brightened by a nearly full moon.
2022年08月07日
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2022-06-01
2022年06月01日:基特峰望远镜上方的武仙T流星-(Tau Herculid Meteors over Kitt Peak Telescopes)
[2022年06月01日:基特峰望远镜上方的武仙T流星-(Tau Herculid Meteors over Kitt Peak Telescopes)--原图下载](https://apod.nasa.gov/apod/image/2206/TauHerMeteors_Lyu_1280.jpg"onMouseOver="if (document.images)document.imagename1.src='image/2206/TauHerMeteors_Lyu_1080_annotated.jpg';"onMouseOut="if (document.images)document.imagename1.src='image/2206/TauHerMeteors_Lyu_1080.jpg';){mtitle title="基特峰望远镜上方的武仙T流星"/}Image Credit & Copyright: Jianwei Lyu (Steward Obs., U. Arizona)说明: 它没出现世纪流星暴,但仍然是值得铭记的夜晚。昨晚是武仙T流星雨的极大期,而这群通常低活跃的流星雨之源头,为碎裂的週期彗星73P/Schwassmann-Wachmann 3(彗星施瓦斯曼-瓦赫曼3)。今年的计算认为,地球或许会穿过特别密集的彗星碎片流,在最佳状况下,可能会产生明亮的武仙座流星暴。实际发生的,算不上是流星暴,但仍是一场蛮像样的流星雨。这幅组合主题影像,呈现5月30日清晨的2.5小时期间,美国.亚利桑那州.基特峰国家天文台上空的景观。在那段期间 ,共记录了19颗武仙流星 和4颗无关的流星(你认得出吗?)。影像较近处的前景,为2.3米口径的Bok望远镜及其后方的4米口径Mayall望远镜。明年的武仙T流星雨预期会回到正常的低活跃状态,而下次的爆发预计会在2049年。{lamp/}原文:{mtitle title="Tau Herculid Meteors over Kitt Peak Telescopes"/}Image Credit & Copyright: Jianwei Lyu (Steward Obs., U. Arizona)Explanation: It wasn't the storm of the century -- but it was a night to remember.Last night was the peak of the Tau Herculidmeteor shower, a usually modest dribble of occasional meteors originating from the disintegrating Comet 73P/Schwassmann-Wachmann 3.This year, calculations showed that the Earth might be passing through a particularly dense stream of comet debris -- at best creating a storm of bright meteors streaking out from the constellation of Hercules.What actually happened fell short of a meteor storm, but could be called a decent meteor shower.Featured here is a composite image taken at Kitt Peak National Observatory in Arizona, USA accumulated over 2.5 hours very late on May 30. Over that time, 19 Tau Herculids meteors were captured, along with 4 unrelated meteors. (Can you find them?) In the near foreground is the Bok 2.3-meter Telescope with the 4.0-meter Mayall Telescope just behind it.Next year, the annual Tau Herculids are expected to return to its normal low rate, with the next active night forecast for 2049.
2022年06月01日
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