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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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2017年11月29日:M42:猎户座大星云-(M42: The Great Orion Nebula)
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2025-02-04
2025年02月04日:反云隙光:西班牙上空的彩虹扇-(Anticrepuscular Rays: A Rainbow Fan over Spain)
2025年02月04日:反云隙光:西班牙上空的彩虹扇-(Anticrepuscular Rays: A Rainbow Fan over Spain)--原图下载{mtitle title="反云隙光:西班牙上空的彩虹扇"/}Image Credit & Copyright: Julene Eiguren说明: 对了,你看到的彩虹有这么精采吗? 在那天的傍晚时分,太阳一如往常的西落,然而,此时最吸睛的,反而是与落日180度反向的东方景观。于东方的天空中,不仅看见一道美丽的彩虹,还能见到看似从彩虹中心射出的反云隙光。 在这张摄于西班牙北部勒基蒂奥镇的照片里,太阳位于摄影者身后。彩虹是阳光被雨滴反射的产物,而反云隙光是因为阳光被云层部分遮挡所产生的影子,然后在穿过天空后,看似会聚于180度反向地平线上的光学幻觉。 彩虹本身就已经够精采,反云隙光则是罕见的光学现象,而能将二者同时捕捉入镜,不仅非常难得,更成就了静谧又梦幻的奇景。{lamp/}原文:{mtitle title="Anticrepuscular Rays: A Rainbow Fan over Spain"/}Image Credit & Copyright: Julene EigurenExplanation: Yes, but can your rainbow do this?Late in the day, the Sun set as usual toward the west.However, on this day, the more interesting display was 180 degrees around -- toward the east.There, not only was a rainbow visible, but an impressive display of anticrepuscular rays from the rainbow's center.In the featured image from Lekeitio in northern Spain, the Sun is behind the camera.The rainbow resulted from sunlight reflecting back from falling rain.Anticrepuscular rays result from sunlight, blocked by some clouds, going all the way around the sky, overhead, and appearing to converge on the opposite horizon -- an optical illusion. Rainbows by themselves can be exciting to see, and anticrepuscular rays a rare treat, but capturing them both together is even more unusual -- and can look both serene and surreal.
2025年02月04日
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2025-01-28
2025年01月28日:乌拉圭上空的阿特拉斯彗星-(Comet G3 ATLAS over Uruguay)
2025年01月28日:乌拉圭上空的阿特拉斯彗星-(Comet G3 ATLAS over Uruguay)--原图下载{mtitle title="乌拉圭上空的阿特拉斯彗星"/}Image Credit & Copyright: Mauricio Salazar说明: 彗星可以是庞然大物。在离太阳很远时,彗星的大小是指由冰和岩石构成的坚实彗核,其宽度通常仅有数公里,甚至比小卫星还要娇小。不过,当来到太阳附近时,彗核会释出尘埃和气体,形成细长的彗尾,而彗尾可能极长,其长度甚至可超过地球与太阳的间距。 如这幅影像所示,阿特拉斯彗星(C/2024 G3 ATLAS)曳着大把反射阳光的尘埃及发光气体长尾,而其跨幅为满月视大小的数倍之多。在长曝光的相机影像里,彗星的彗尾之规模远胜于肉眼所见。 这张大约一週前摄于乌拉圭 圣荷西市马霍马山脉的主题影像,呈现了阿特拉斯彗星悬在绿树和青草地上空的壮丽景象。在地球南半球的日落后天空中,阿特拉斯彗星曾经非常吸睛,但随着它逐渐远离太阳,其亮度也在减弱,让它壮观的彗尾愈来愈难以再现。{lamp/}原文:{mtitle title="Comet G3 ATLAS over Uruguay"/}Image Credit & Copyright: Mauricio SalazarExplanation: Comets can be huge.When far from the Sun, a comet's size usually refers to its hard nucleus of ice and rock, which typically spans a few kilometers -- smaller than even a small moon.When nearing the Sun, however, this nucleus can eject dust and gas and leave a thin tail that can spread to an enormous length -- even greater than the distance between the Earth and the Sun.Pictured, C/2024 G3 (ATLAS) sports a tail of sunlight-reflecting dust and glowing gas that spans several times the apparent size of a full moon, appearing even larger on long duration camera images than to the unaided eye.The featured image shows impressive Comet ATLAS over trees and a grass field in Sierras de Mahoma, San Jose, Uruguay about a week ago. After being prominent<?a> in the sunset skies of Earth's southern hemisphere, Comet G3 ATLAS is now fading as it moves away from the Sun, making its impressive tails increasingly hard to see.
2025年01月28日
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2025-01-27
2025年01月27日:半圆丘上空的昴宿星团-(Pleiades over Half Dome)
2025年01月27日:半圆丘上空的昴宿星团-(Pleiades over Half Dome)--原图下载{mtitle title="半圆丘上空的昴宿星团"/}Image Credit & Copyright: Dheera Venkatraman说明: 恒星会抱团。地球天空中最着名的恒星抱团是昴宿星团,一个肉眼轻易可见的明亮星团。昴宿星团近在450光年之处,大约形成于1亿年前,而恒星形成活动可能还会再持续约2.5亿年。太阳当初很可能也是诞生于星团里,但如今已45亿年高龄的太阳,其星团同胞早已分道扬镳。在上图里,昴宿星团悬在美国 加利福尼亚州优胜美地国家公园着名巨岩半圆丘的上方。这幅摄于2019年10月的主题影像,是由位在相同地点、相同相机在同一晚所拍摄的28张前景照片和174张背景恒星照片组合而成。在精算好昴宿星团和半圆丘并排的时间之后,这位个天文摄影者还因当地停电而获得意外的奖赏,因为背景天空变得格外的幽暗。{lamp/}原文:{mtitle title="Pleiades over Half Dome"/}Image Credit & Copyright: Dheera VenkatramanExplanation: Stars come in bunches. The most famous bunch of stars on the sky is the Pleiades, a bright cluster that can be easily seen with the unaided eye. The Pleiades lies only about 450 light years away, formed about 100 million years ago, and will likely last about another 250 million years.Our Sun was likely born in a star cluster, but now, being about 4.5 billion years old, its stellar birth companions have long since dispersed.The Pleiades star cluster is pictured over Half Dome, a famous rock structure in Yosemite National Park in California, USA.The featured image is a composite of 28 foreground exposures and 174 images of the stellar background, all taken from the same location and by the same camera on the same night in October 2019.After calculating the timing of a future juxtaposition of the Pleiades and Half Dome, the astrophotographer was unexpectedly rewarded by an electrical blackout, making the background sky unusually dark.
2025年01月27日
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2025-01-26
2025年01月26日:阿特拉斯彗星的彗尾-(The Many Tails of Comet G3 ATLAS)
2025年01月26日:阿特拉斯彗星的彗尾-(The Many Tails of Comet G3 ATLAS)--原图下载{mtitle title="阿特拉斯彗星的彗尾"/}Image Credit & Copyright: Martin Mašek (FZU, Czech Academy of Sciences) & Jakub Kuřák说明: 为何这颗彗星有这么多条彗尾?南天清楚可见的阿特拉斯彗星(C/2024 G3 ATLAS),于过去2星期中发展出数条长且複杂的彗尾。许多观测者说,这颗悬在日落后西方地平线上空的壮观彗星,即使不借助光学仪器也清楚可见。 在这幅记录5天前智利 帕连那天文台幽暗夜空的主题影像里,这颗彗星曳着至少6条彗尾。造成多条彗尾的可能成因之一,是所释出的尘埃和气体,其源头为这颗彗星不停转动的彗核。而太阳複杂多变的太阳风的外向推力,可能也起了部分作用。 此外,阿特拉斯彗星大如冰山的彗核,二星期前在近日点附近时似乎发生崩解(,可能因此造成了多条彗尾)。很遗憾的是,随着彗星远离,阿特拉斯彗星及其彗尾的亮度,在未来几週内预期会大幅下降。{lamp/}原文:{mtitle title="The Many Tails of Comet G3 ATLAS"/}Image Credit & Copyright: Martin Mašek (FZU, Czech Academy of Sciences) & Jakub KuřákExplanation: Why does this comet have so many tails?C/2024 G3 (ATLAS) has developed several long and intricate tails visible from Earth's southern hemisphere over the past two weeks.Many observers reported seeing the impressive comet without any optical aid above the western horizon just after sunset.At least six different tails appear in the featured image captured five days ago from the dark skies above Paranal Observatory in Chile. One possible cause for the multiple tails is dust and gas being expelled from the comet's rotating nucleus.The outward push of the Sun's complex solar wind may also play a role.The huge iceberg-like nucleus of Comet ATLAS appears to have broken up near its closest approach to the Sun two weeks ago. Unfortunately, Comet ATLAS and its tails are expected to fade significantly over the coming weeks.
2025年01月26日
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2025-01-21
2025年01月21日:巴西利亚市上空的阿特拉斯彗星-(Comet ATLAS over Brasília)
2025年01月21日:巴西利亚市上空的阿特拉斯彗星-(Comet ATLAS over Brasília)--原图下载{mtitle title="巴西利亚市上空的阿特拉斯彗星"/}Image Credit: Frederico Danin说明: 悬在天空中的是什么?悬在这座城市上空、大部分云层的上方与遥远的天际的是一颗彗星。这幅摄于4天前、呈现阿特拉斯彗星(C/2024 G3 ATLAS)曳着壮观彗尾的影像,拍摄地点是巴西的首府巴西利亚市。 在上星期,这颗不断演变的彗星旋绕过太阳,并深入水星的轨道之内,来到非常靠近太阳的位置,以至于它有崩解之虞,而最新的迹证显示,它的确也发生崩解。在近日点附近时,阿特拉斯彗星的亮度甚至达到白画可见的程度,连在太阳附近的炫亮白画天空中,有适当护具的观察者就能见到它的身影。 过去几天,阿特拉斯彗星长出了一道颀长的彗尾,尤其在南半球的日落后,用肉眼就能隐约见到彗尾的风采。{lamp/}原文:{mtitle title="Comet ATLAS over Brasília"/}Image Credit: Frederico DaninExplanation: What's that in the sky?Above the city, above most clouds, far in the distance: it's a comet.Pictured, the impressive tail of Comet C/2024 G3 (ATLAS) was imaged from Brasília, Brazil four days ago.Last week the evolving comet rounded the Sun well inside the orbit of planet Mercury, going so close there was early concern that it might break up -- and recent evidence that it really did. At one point near perihelion, Comet ATLAS was so bright that sightings were even reported during the day -- over the bright sky near the Sun -- by careful observers. Over the past few days, Comet ATLAS has developed a long tail that has been partly visible with unaided eyes after sunset, most notably in Earth's southern hemisphere.
2025年01月21日
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2025-01-20
2025年01月20日:阿特拉斯彗星绕过太阳-(Comet ATLAS Rounds the Sun)
2025年01月20日:阿特拉斯彗星绕过太阳-(Comet ATLAS Rounds the Sun)--原图下载{mtitle title="阿特拉斯彗星绕过太阳"/}Image Credit: NASA, SOHO Spacecraft, LASCO C3;Processing: Rolando Ligustri说明: 为何阿特拉斯彗星的彗尾如此多彩?在上星期,阿特拉斯彗星(Comet C/2024 G3 ATLAS)彗星来到深在水星轨道之内的近日点,并戏剧性的增亮。很遗憾的,此彗星与太阳的分离角太小,使得人类用肉眼难以直接观看。不过,美国航太总署的SOHO观日卫星,倒是捕捉到它的身影。 这幅SOHO卫星的LASCO C3日冕仪影像,组合了多个不同色彩滤镜的数据。影像里,阿特拉斯彗星的多条彗尾之中,中央泛白的长尾,可能是反射阳光的尘埃尾。而红、蓝与绿等色泽的彗尾,则可能是彗星释出的特定气体受到阳光的电离激发而发光,所以是离子尾。目前,曳着长长彗尾的阿特拉斯彗星位于南半球的天空中,不过随着它缓缓远离太阳系内围,其亮度也逐渐衰减。{lamp/}原文:{mtitle title="Comet ATLAS Rounds the Sun"/}Image Credit: NASA, SOHO Spacecraft, LASCO C3;Processing: Rolando LigustriExplanation: Why does Comet ATLAS have such colorful tails?Last week Comet C/2024 G3 (ATLAS) passed its closest to the Sun -- well inside the orbit of Mercury -- and brightened dramatically. Unfortunately, the comet was then so angularly near the Sun that it was very hard for humans to see.But NASA's SOHO spacecraft saw it.Pictured is a SOHO (LASCO C3) image of Comet ATLAS that is a composite of several different color filters.Of the several tails visible, the central white tails are likely made of dust and just reflecting back sunlight.The red, blue, and green tails are likely ion tails with their colors dominated by light emitted by specific gases that were ejected from the comet and energized by the Sun. Currently, Comet ATLAS is showing long tails in southern skies but fading as it moves out of the inner Solar System.
2025年01月20日
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