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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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2023-10-24
2023年10月24日:Arp 87:哈伯拍摄的合併中星系对-(Arp 87: Merging Galaxies from Hubble)
2023年10月24日:Arp 87:哈伯拍摄的合併中星系对-(Arp 87: Merging Galaxies from Hubble)--原图下载{mtitle title="Arp 87:哈伯拍摄的合併中星系对"/}Image Credit: NASA, ESA, Hubble;Processing: Harshwardhan Pathak说明: 这是死亡之舞。在此过程中,随着这二个大星系进行缠斗,一道由恒星、云气和尘埃所构成,绵延超过75,000光年的宇宙桥联结了这对星系。这道宇宙长桥明确地指证,这两个庞大的恒星系统曾近距离通过对方附近,而彼此之间的重力互扰引发了剧烈的潮汐。作为进一度的佐证,影像右侧的正面螺旋星系NGC 3808A,经历了爆发性的恒星形成活动,并产生许多泛蓝的年轻星团。而左方扭曲的侧向星系NGC 3808B,则被星系间的长桥物质及一个很有趣的绕极环所包裹。这个带着Arp 87编号的系统,因其外貌而被归类为特殊天体。这种重力交互作用的历程长达数十亿年,但重複的近距离穿越,最终会让它们合併成单一个星系。虽然这种景象看起来相当奇特,但星系合併咸认是很常见的现象,而Arp 87则代表这种必然过程的中间阶段。Arp 87星系对位在狮子座方向,离我们约有3亿光年远。影像左缘的醒目侧向螺旋星系,是一个更遥远的背景星系,并未参与这场进行中的星系合併。{lamp/}原文:{mtitle title="Arp 87: Merging Galaxies from Hubble"/}Image Credit: NASA, ESA, Hubble;Processing: Harshwardhan PathakExplanation: This dance is to the death. As these two large galaxies duel, a cosmic bridge of stars, gas, and dust currently stretches over 75,000 light-years and joins them. The bridge itself is strong evidencethat these two immense star systems havepassed close to each otherand experienced violent tides induced by mutual gravity.As further evidence, the face-on spiral galaxy onthe right, also known as NGC 3808A,exhibits many young blue star clusters produced in a burstof star formation.The twisted edge-on spiral on the left (NGC 3808B) seems to be wrappedin the material bridging the galaxies andsurrounded by a curiouspolar ring.Together, the system is known as Arp 87.While such interactions are drawn out over billions of years, repeatedclose passages will ultimately create one merged galaxy.Althoughthis scenario does look unusual, galactic mergers are thoughtto be common, with Arp 87 representing a stage inthisinevitable process.The Arp 87 dancing pair areabout 300 million light-yearsdistant toward the constellation of the Lion (Leo).The prominent edge-on spiral galaxy at the far leftappears to be a more distant background galaxy andnot involved in the on-going merger.
2023年10月24日
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2023-10-07
2023年10月07日:仙女大星系过去和未来的恆星-(The Once and Future Stars of Andromeda)
[2023年10月07日:仙女大星系过去和未来的恆星-(The Once and Future Stars of Andromeda)--原图下载](https://apod.nasa.gov/apod/image/2310/M31_HubbleSpitzerGendler_2000.jpg"onMouseOver="if (document.images)document.imagename1.src='image/2310/M31_HubbleSubaruGendler_960.jpg';"onMouseOut="if (document.images)document.imagename1.src='image/2310/M31_HubbleSpitzerGendler_960.jpg';){mtitle title="仙女大星系过去和未来的恆星"/}Image Credit: NASA, NSF, NOAJ, Hubble, Subaru,Mayall, DSS, Spitzer; Processing & Copyright: Robert Gendler & Russell Croman说明: 这幅仙女大星系的影像,不仅显示目前恒星之所在,也呈现了未来恒星即将现身的位区。如众所熟知的,庞大美丽的仙女大星系(M31),是个离我们只有2百50万光年远的螺旋星系。这幅很有趣的仙女大星系组合影像,整合了太空与地基望远镜的观测数据,以同时呈现此星系在可见光及非可见光波段的景观。影像里的白与蓝色、呈现哈伯、昴宿、及Mayall望远镜的可见光数据,用以突显M31目前恒星所在的位置。而来自美国航太总署.史匹哲太空望远镜的橙色红外光数据,则显示M31未来的恒星即将形成的区域。红外光数据所显示的,是仙女大星系广袤的螺旋臂上,受到恒星加热的庞然尘埃带。这些尘埃是此星系大量星际气体的示踪物,更是未来恒星形成的原材料。很可确定的是,这些新恒星很可能会形成于接下来的一亿年里,远在约50亿年后仙女座与我们的银河系合併之前。{lamp/}原文:{mtitle title="The Once and Future Stars of Andromeda"/}Image Credit: NASA, NSF, NOAJ, Hubble, Subaru,Mayall, DSS, Spitzer; Processing & Copyright: Robert Gendler & Russell CromanExplanation: This picture of Andromeda shows not only where stars are now, but where stars will be.The big, beautiful Andromeda Galaxy,M31, is a spiral galaxya mere 2.5 million light-yearsaway. Image data from space-based and ground-based observatories have been combined here to produce this intriguing compositeview of Andromeda at wavelengths bothinside and outside normally visible light.The visible lightshows where M31's stars are now, highlighted inwhite and blue hues and imaged by the Hubble, Subaru, and Mayall telescopes. The infrared lightshows where M31's future stars will soon form,highlighted in orange hues and imaged by NASA's Spitzer Space Telescope. The infrared light tracks enormous lanes of dust, warmed by stars, sweeping along Andromeda's spiral arms. This dust is a tracer of the galaxy's vastinterstellar gas, raw material for future star formation. Of course, the new stars will likely form over the next hundred million years or so.That's well before Andromeda merges with our Milky Way Galaxy in about 5 billion years.
2023年10月07日
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2023-10-04
2023年10月04日:IC 2118:女巫头星云-(IC 2118: The Witch Head Nebula)
2023年10月04日:IC 2118:女巫头星云-(IC 2118: The Witch Head Nebula)--原图下载{mtitle title="IC 2118:女巫头星云"/}Image Credit & Copyright: Abdullah Alharbi说明: 这个星云看起来像女巫的头吗?这个星云之所以有"女巫头星云"的称号,则是因为它的外观形似万圣节风格漫画的女巫之头部。不过,它究竟是如何形成的,至真仍是一个富有想像力的题材。很可确定的是,IC 2118约有50光年宽,由气体和尘埃所组成,并且面向附近的参宿七,因为它已被这颗恒星侵蚀掉了一部分。参宿七是猎户座的亮星之一,位于这张主题影像的底缘下方。女巫头星云的泛蓝色泽,除了因为参宿七强烈的泛蓝星光之外,也因为它的尘埃微粒散射蓝光的效率高于红光。同样的物理过程也造就了地球白昼的蓝天,只不过地球大气里的散射体是氮和氧分子。{lamp/}原文:{mtitle title="IC 2118: The Witch Head Nebula"/}Image Credit & Copyright: Abdullah AlharbiExplanation: Does this nebula look like the head of a witch?The nebula is known popularly as the Witch Head Nebula because, it is said, the nebula's shape resembles a Halloween-style caricature of a witch's head.Exactly how, though, can be a topic of imaginative speculation. What is clear is that IC 2118 is about 50 light-years across and made of gas and dust that points to -- because it has been partly eroded by -- the nearby star Rigel.One of the brighter stars in the constellation Orion, Rigel lies below the bottom of the featured image.The blue color of the Witch Head Nebula and is caused not only by Rigel's intense blue starlight but because the dust grains scatter blue light more efficiently than red. The same physical process causes Earth's daytime sky to appear blue, although the scatterers in planet Earth's atmosphere are molecules of nitrogen and oxygen.
2023年10月04日
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2023-09-25
2023年09月25日:Arp 142:蜂鸟星系-(Arp 142: The Hummingbird Galaxy)
2023年09月25日:Arp 142:蜂鸟星系-(Arp 142: The Hummingbird Galaxy)--原图下载{mtitle title="Arp 142:蜂鸟星系"/}Image Credit: NASA, ESA, Hubble, HLA;Processing & Copyright:Basudeb Chakrabarti说明: 这个螺旋星系发生了什么事?近在数亿年前,影像中这二个大星系位在上方的NGC 2936,很可能还是一个正常的螺旋星系,自顾自的旋转、创造恒星、忙自己的事。后来,它太靠近下方的庞大椭圆星系NGC 2937,于是情况就急转直下。因其标誌性的外观而有蜂鸟星系之称的NGC 2936,在近距离重力交互作用的扰动下,不但方向发生了偏移,外观也出现了扭曲。在黝黑星际尘埃细丝的后方,可见到由明亮泛蓝恒星所构成的鸟喙,而螺旋的中心则像一只眼睛。此外,合称为Arp 142的这对星系,在某些人的眼里形似鼠海豚或在抱蛋的企鹅。这幅经过重处理的极细緻主题影像,是哈伯太空望远镜最近所拍摄的影像之一。Arp 142位于长蛇座方向约3亿光年远之处。大约在10亿年之内,这2个星系可能会合併成一个更大的星系。(Hummingbird Galaxy 蜂鸟星系;Porpoise Galaxy 鼠海豚星系){lamp/}原文:{mtitle title="Arp 142: The Hummingbird Galaxy"/}Image Credit: NASA, ESA, Hubble, HLA;Processing & Copyright:Basudeb ChakrabartiExplanation: What's happening to this spiral galaxy?Just a few hundred million years ago, NGC 2936, the upper of the two large galaxies shown at the bottom, was likely a normal spiral galaxy -- spinning, creating stars -- and minding its own business.But then it got too close to the massive elliptical galaxy NGC 2937, just below, and took a turn.Sometimes dubbed the Hummingbird Galaxy for its iconic shape, NGC 2936 is not only being deflected but also being distorted by the close gravitational interaction.Behind filaments of dark interstellar dust, bright blue stars form the nose of the hummingbird, while the center of the spiral appears as an eye. Alternatively, the galaxy pair, together known as Arp 142, look to some like Porpoise or a penguin protecting an egg.The featured re-processed image showing Arp 142 in great detail was taken recently by the Hubble Space Telescope.Arp 142 lies about 300 million light years away toward the constellation of the Water Snake (Hydra).In a billion years or so the two galaxies will likely merge into one larger galaxy.
2023年09月25日
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2023-09-04
2023年09月04日:天鹅座的皂泡与眉月星云-(Cygnus: Bubble and Crescent)
2023年09月04日:天鹅座的皂泡与眉月星云-(Cygnus: Bubble and Crescent)--原图下载{mtitle title="天鹅座的皂泡与眉月星云"/}Credit & Copyright: Abdullah Al-Harbi说明: 恒星濒死时会创造星云。这二团恒星死亡时所产生的气体与尘埃云,漂流在银河系盘面天鹅座方向的富星场里。位在这幅望远镜视野里的皂泡星云(左下)及眉月星云(右上),都是由处在最终演化阶段的恒星所产生的。其中,亦名为NGC 6888的眉月星云,是由位在其中心的明亮大质量沃夫-瑞叶恒星(WR 136),以强烈的恒星风抛出它的外层气壳所形成的。而以惊人速率消耗核燃料的WR 136,处在它短暂生命的终点附近,最后会以壮观的超新星爆炸谢幕。2013年才发现的皂泡星云,很可能是个行星状星云;它是一颗注定将成为缓缓冷却白矮星的长寿、小质量类太阳恒星所抛出之气体寿衣。这二团星云的距离都在5,000光年上下,较庞大的眉月星云跨幅约为25光年。在数百万年之内,这二团星云可能都会消散匿蹤。{lamp/}原文:{mtitle title="Cygnus: Bubble and Crescent"/}Credit & Copyright: Abdullah Al-HarbiExplanation: As stars die, they create clouds. Two stellar death clouds of gas and dust can be found toward the high-flying constellation of the Swan (Cygnus)as they drift throughrich star fields in the plane of our Milky Way Galaxy.Caught here within thetelescopicfield of view are theSoap Bubble (lower left) and theCrescent Nebula (upper right).Both were formed at the final phase in the life of a star.Also known as NGC 6888,the Crescent Nebula was shaped as its bright, central massiveWolf-Rayetstar, WR 136, shed its outer envelope ina strong stellar wind.Burning through fuel at a prodigious rate, WR 136 is near the end ofa short lifethat should finish in a spectacularsupernova explosion.Discovered in 2013, the Soap Bubble Nebula is likely aplanetarynebula, the final shroud of a lower mass, long-lived, Sun-like stardestined to become a slowly cooling white dwarf.Both stellar nebulas are about 5,000 light-years distant, with the larger Crescent Nebula spanning about 25 light-years across.Within a few million years, both will likely have dispersed.
2023年09月04日
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2023-08-14
2023年08月14日:韦伯望远镜的环状星云-(The Ring Nebula from Webb and Hubble)
2023年08月14日:韦伯望远镜的环状星云-(The Ring Nebula from Webb and Hubble)--原图下载{mtitle title="韦伯望远镜的环状星云"/}Credit: NASA,ESA,CSA,JWST,HST;Processing: Zi Yang Kong, Go Webb!说明: 环状星云(M57)远比透过小望远镜所见的要複杂得多。通常轻易可见的是直径约1光年的中心环,然而,来自韦伯太空望远镜的这幅精采长曝光红外影像,深入的探索了这个热门的星云。在这幅经过数位强化的代表色主题影像里,中心环周围清楚可见的气体丝,形似宇宙之眼的睫毛。而长线形的结构,或许是环内的緻密气体结,遮挡来自内部的高能星光所产生的影子。环状星云是个细长形的行星状星云,为类太阳恒星演化抛出外层大气成为白矮星时,所产生的气体云。环状星云的中心椭圆结构,位在以乐器为名的天琴座方向约2500光年远之处。{lamp/}原文:{mtitle title="The Ring Nebula from Webb and Hubble"/}Credit: NASA,ESA,CSA,JWST,HST;Processing: Zi Yang Kong, Go Webb!Explanation: The Ring Nebula (M57), is more complicated than it appears through a small telescope. The easily visible central ring is about one light-year across,but this remarkable combined exposure by the James Webb Space Telescope and the Hubble Space Telescope explores this popular nebula with deep exposures in visible and infrared light.Strings of gas, like eyelashes around a cosmic eye, become evident around the Ringin this digitally enhanced featured image in assigned colors.These long filaments may be caused by shadowing of knots of dense gas in the ring from energetic light emitted within.The Ring Nebula is an elongated planetary nebula, a type of gas cloud created when a Sun-like star evolves to throw off its outer atmosphere to become a white dwarf star. The central oval in the Ring Nebula lies about 2,500 light-years away toward the musicalconstellationLyra.
2023年08月14日
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