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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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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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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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2025-01-22
2025年01月22日:北美洲星云-(The North America Nebula)
2025年01月22日:北美洲星云-(The North America Nebula)--原图下载{mtitle title="北美洲星云"/}Image Credit & Copyright: Dimitris Valianos说明: 天空中的北美洲星云,能做到地球上的北美洲无法做到的事——形成恒星。 较具体来说,形似地球北美洲明亮东岸的天鹅座墙,其实是气体、尘埃和新诞生恒星的複合体。如这幅主题影像所示,这道恒星诞生之墙正受到年轻亮星的照耀和侵蚀,而这些新恒星所产生的黝黑尘埃也遮掩了部分的墙体。影像所呈现的部分北美洲星云 (NGC 7000),宽约50光年,位于天鹅 座方向约1,500光年远之处。{lamp/}原文:{mtitle title="The North America Nebula"/}Image Credit & Copyright: Dimitris ValianosExplanation: The North America nebula on the sky can do what theNorth America continent on Earth cannot -- form stars. Specifically, in analogy to the Earth-confined continent, the bright part that appears as the east coast is actually a hot bed of gas, dust, and newly formed stars known as the Cygnus Wall. The featured image shows the star forming wall lit and eroded by bright young stars and partly hidden by the dark dust they have created. The part of the North America nebula (NGC 7000) shown spans about 50 light years and lies about 1,500 light years away toward the constellationof the Swan (Cygnus).
2025年01月22日
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2024-11-26
2024年11月26日:韦伯与哈伯影像:草帽星系-(The Sombrero Galaxy from Webb and Hubble)
2024年11月26日:韦伯与哈伯影像:草帽星系-(The Sombrero Galaxy from Webb and Hubble)--原图下载{mtitle title="韦伯与哈伯影像:草帽星系"/}Image Credit: NASA,ESA,CSA,STScI, Hubble Heritage Project (STScI, AURA)说明 : 这个漂浮的环状结构大如星系。事实上,它就是很上相的草帽星系,或者至少是草帽星系的一部分,而草帽星系则是邻近的室女座星系团里最大的星系之一。在可见光清楚可见、环绕在草帽星系腰部的黝黑尘埃带(下图),于红外光波段显得格外的明亮(上图)。在这张主题影像里,以泛蓝假色呈现的红外辉光,是刚在昨天发布的韦伯太空望远镜影像,而上图则是哈伯太空望远镜的库存 可见光影像。大小约为5万光年、离我们约2千8百万光年远的草帽星系,亦名为M104。 位于北天室女座方向的M104,用小望远镜即可见。{lamp/}原文:{mtitle title="The Sombrero Galaxy from Webb and Hubble"/}Image Credit: NASA,ESA,CSA,STScI, Hubble Heritage Project (STScI, AURA)Explanation: This floating ring is the size of a galaxy. In fact, it is a galaxy -- or at least part of one: the photogenicSombrero Galaxyis one of the largest galaxies in the nearbyVirgo Cluster of Galaxies. The dark band ofdust that obscures the mid-section of theSombrero Galaxy in visible light (bottom panel) actually glows brightly in infrared light (top panel). The featured image shows theinfraredglow in false blue, recorded recently by the space-based James Webb Space Telescope (JWST) and released yesterday, pictured above anarchival image taken byNASA's Hubble Space Telescope in visible light.The SombreroGalaxy, also known asM104, spans about 50,000 light years and lies 28 million light years away. M104can be seen with a small telescope in the direction of theconstellation Virgo.
2024年11月26日
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2024-11-18
2024年11月18日:小精灵星云的恆星与尘埃云-(Stars and Dust in the Pacman Nebula)
2024年11月18日:小精灵星云的恆星与尘埃云-(Stars and Dust in the Pacman Nebula)--原图下载{mtitle title="小精灵星云的恆星与尘埃云"/}Image Credit & Copyright: Malcolm Loro说明: 诞生于緻密暗分子云内的恒星,经常会创造出庞大且形状複杂的尘埃雕塑。恒星用以雕出它们细緻作品的工具,则是高能星光及高速的恒星风。它们所产生的热,会蒸发孕育它们的暗分子云之尘埃,并吹散周围的氢气并激发它们发出泛红辉光。在上面这幅影像中,位在发射星云NGC 281里、周围环拱着複杂星际尘埃结构、编录号为IC 1590的疏散星团,几乎已完成它的工作。因其整体的外观,NGC 281亦有小精灵星云(Pac-man)的暱称。影像左上角的尘埃云之分类为包克云球,而它未来可能会发生重力塌缩形成恒星。小精灵星云位在仙后座方向,离我们约10,000光年远。{lamp/}原文:{mtitle title="Stars and Dust in the Pacman Nebula"/}Image Credit & Copyright: Malcolm LoroExplanation: Stars can create huge and intricate dust sculptures from the dense and dark molecular clouds from which they are born. The tools the stars use to carve their detailed works are high energy light and fast stellar winds. The heat they generate evaporates the dark molecular dust as well as causing ambient hydrogen gas to disperse and glow. Pictured here, a new open cluster of stars designated IC 1590 is nearing completion around the intricate interstellar dust structures in the emission nebula NGC 281,dubbed the Pac-man Nebula because of its overall shape. The dust cloud just above center is classified as a Bok Globule as it may gravitationally collapse and form a star -- or stars.The Pacman Nebula lies about 10,000 light years away toward the constellation of Cassiopeia.
2024年11月18日
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2024-08-19
2024年08月19日:IC 5146:茧状星云-(IC 5146: The Cocoon Nebula)
2024年08月19日:IC 5146:茧状星云-(IC 5146: The Cocoon Nebula)--原图下载{mtitle title="IC 5146:茧状星云"/}Image Credit & Copyright: Luis Romero Ventura说明: 茧状星云内有个正在形成的星团。直径将近15光年、编录号为IC 5146的茧状星云,座落在北半球夏季夜空的天鹅座方向约4,000光年远之处。如同其他的恒星形成区一样,这个位在一团不可见分子云边缘的星云,其内的氢气因受到炽热年轻恒星激发而发出泛红的辉光,而部分尘埃则因为反射星光而呈蓝色。事实上,位在星云中心附近、可能只有数百万年稚龄的亮星,除了激发星云发光之外,也在孕育恒星的分子云尘埃和气体里清出一个空穴。这幅总曝光时间长达48小时的极深空彩色影像,清楚呈现了这个满是尘埃的恒星形成区内部与周围的迷人特徵结构。{lamp/}原文:{mtitle title="IC 5146: The Cocoon Nebula"/}Image Credit & Copyright: Luis Romero VenturaExplanation: Inside the Cocoon Nebula is a newly developing cluster of stars.Cataloged asIC 5146, the beautifulnebula is nearly 15 light-years wide.Soaring high innorthern summer night skies,it's located some 4,000 light years away toward the constellation of the Swan (Cygnus). Like other star forming regions, it stands outin red, glowing, hydrogen gasexcited by young, hot stars,and dust-reflected starlightat the edge of an otherwise invisiblemolecular cloud. In fact, the bright star found near the center of this nebula is likelyonly a few hundred thousand years old, powering the nebular glow as itclears out a cavity in the molecular cloud's star forming dust and gas.A 48-hour long integration resulted in thisexceptionally deep color view tracing tantalizing features within and surrounding the dustystellarnursery.
2024年08月19日
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2024-06-11
2024年06月11日:心宿增四附近的色彩缤纷恆星与云气-(Colorful Stars and Clouds near Rho Ophiuchi)
2024年06月11日:心宿增四附近的色彩缤纷恆星与云气-(Colorful Stars and Clouds near Rho Ophiuchi)--原图下载{mtitle title="心宿增四附近的色彩缤纷恆星与云气"/}Image Credit & Copyright: Craig Stocks说明: 为何心宿二与心宿增四附近天空的色彩会如此缤纷呢?这些色彩源自该区域的天体和一些物理过程。首先,微细的尘埃受到前方星光的照射,因而产生了泛蓝的反射星云。紫外星光则激发了气体云内的原子,产生了泛红的发射星云,而背光的尘埃遮住了后方的星光,其黝黑的身影成为暗星云。照亮这幅主题影像中下方黄红星云的心宿二,除了是颗红超巨星之外,也是夜空中的亮星之一。此外,位于影像左侧泛蓝星云中心处的是心宿增四恒星系统,而在影像的中右下方可见到另一个不同的反射星云IC 4605。影像中的这些星云所散发的色彩,远超出了人类肉眼之可见,遍及所有的电磁波段。(Antare 心宿二;Rho Ophiuchi 心宿增四){lamp/}原文:{mtitle title="Colorful Stars and Clouds near Rho Ophiuchi"/}Image Credit & Copyright: Craig StocksExplanation: Why is the sky near Antares and Rho Ophiuchi so colorful, yet dusty? The colors result from a mixture of objects and processes. Fine dust -- illuminated by starlight -- produces bluereflection nebulae.Gaseous clouds whose atoms are excited by ultraviolet starlight produce reddish emission nebulae.Backlit dust clouds block starlight and soappear dark. Antares,a red supergiant and one of the brighter stars in the night sky, lights up the yellow-red clouds on the upper right of the featured image.The Rho Ophiuchi star system lies at the center of the blue reflection nebula on the left, while a different reflection nebula, IC 4605, lies just below and right of the image center. These star clouds are even more colorful than humans can see,emitting light across the electromagnetic spectrum.
2024年06月11日
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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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