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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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2023-09-26
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.
2023年09月26日
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2021-11-03
2021年11月03日:马头星云与火焰星云-(The Horsehead and Flame Nebulas)
2021年11月03日:马头星云与火焰星云-(The Horsehead and Flame Nebulas)--原图下载{mtitle title="马头星云与火焰星云"/}Image Credit & Copyright: Wissam Ayoub说明: 马头星云是地球天空中最着名的星云之一。在这张影像右缘的红色发射星云上,那片黝黑斑块就是马头星云。而“马头”会如此黝黑,因它是这片明亮发射星云前方的不透光尘埃云。类似地球大气中的云朵,这团宇宙云只是恰巧有个我们很熟悉的形状。再经过数千年,星云内部的运动将改变它的外观。发射星云橙红的色泽,是来自电子和质子复合组成氢原子时所放出的光。而影像左下方的天体,则是橙色的火焰星云,其内有形状繁複的丝状黝黑尘埃。这幅影像更记录了2个鲜明的反射星云,它们分别是左缘形状浑圆的IC 432和马头星云左下方泛蓝的NGC 2023,它们的色泽来自尘埃反射中心星的星光。{lamp/}原文:{mtitle title="The Horsehead and Flame Nebulas"/}Image Credit & Copyright: Wissam AyoubExplanation: The HorseheadNebula is one of the most famous nebulae on the sky. It is visible as the dark indentation to the orangeemission nebula at the far right of the featured picture. The horse-head feature is dark because it is really an opaquedust cloud that lies infront of the bright emission nebula.Like clouds inEarth's atmosphere, this cosmic cloud has assumed arecognizable shape by chance. After many thousands of years, the internal motions of the cloudwill surely alter its appearance. The emission nebula's orange color is caused by electrons recombining with protons to formhydrogen atoms. Toward the lower left of the image is the Flame Nebula, an orange-tinged nebula that also contains intricate filaments of dark dust.Two prominent reflection nebulas are visible: round IC 432 on the far left, and blue NGC 2023 just to the lower left of the Horsehead nebula. Each glows primarily by reflecting the light of their central star.
2021年11月03日
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2021-10-17
2021年10月17日:爱因斯坦的重力透镜十字架-(The Einstein Cross Gravitational Lens)
2021年10月17日:爱因斯坦的重力透镜十字架-(The Einstein Cross Gravitational Lens)--原图下载{mtitle title="爱因斯坦的重力透镜十字架"/}Image Credit & License: J. Rhoads(Arizona State U.) et al.,WIYN,AURA,NOIRLab,NSF说明: 大部份的星系只有单一个核心,不过,上面这个星系真的有四个核心吗? 由于这种答案实在太怪异了,让天文学家断言,在这张影像里,根本就看不见这个星系的核心。影像中心的苜蓿叶形天体,其实是来自一个位于背景的类星体,由于前景星系的强大重力场,才把遥远类星体的光,分裂成四个独立的影像。要出现这种类似海市蜃楼的现象,类星体要恰好排列在大质量星系核心的正后方。 这个效应称为重力透镜,而上面这种形态的影像称为爱因斯坦十字架。更有意思的是,这例爱因斯坦十字架的亮度会有变化,会因为前景星系中恒星所造成的重力微透镜效应,亮度偶而会增加。{lamp/}原文:{mtitle title="The Einstein Cross Gravitational Lens"/}Image Credit & License: J. Rhoads(Arizona State U.) et al.,WIYN,AURA,NOIRLab,NSFExplanation: Most galaxies have a single nucleus -- does this galaxy have four? The strange answer leads astronomers to conclude that the nucleus of the surrounding galaxy is not even visible in this image. The central cloverleaf is rather light emitted from a background quasar. The gravitational field of the visible foreground galaxy breaks light from this distant quasar into four distinct images. The quasar must be properly aligned behind the center of a massive galaxy for a mirage like this to be evident. The general effect is known as gravitational lensing, and this specific case is known as the Einstein Cross. Stranger still, the images of the Einstein Cross vary in relative brightness, enhanced occasionally by the additional gravitational microlensing effect of specific stars in the foreground galaxy.
2021年10月17日
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2021-07-05
2021年07月05日:IC 4592:蓝马头反射星云-(IC 4592: The Blue Horsehead Reflection Nebula)
2021年07月05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: Adam Block,Steward Observatory,University of Arizona说明: 你看到马头吗?你看见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,类似的马头形状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,是编号为IC 4592的反射星云。反射星云是由微小的尘埃所组成,通常看起是黝黑的,不过在反射附近炽热恒星的可见光 之后,却可能变得很蓝。在上面这个範例里,大部份所反射的星光是来自位在马 眼的恒星。 这颗恒星是尾宿九(Nu Scorpii)的成员之一,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,可以看见围绕在二颗恒星周围、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: Adam Block,Steward Observatory,University of ArizonaExplanation: 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 a reflection nebula cataloged as IC 4592. Reflection nebulas are actually 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 to the right of the image center.
2021年07月05日
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2017-12-17
2017年12月17日:爱因斯坦的重力透镜十字架 -(The Einstein Cross Gravitational Lens)
2017年12月17日:爱因斯坦的重力透镜十字架 -(The Einstein Cross Gravitational Lens)--原图下载{mtitle title="爱因斯坦的重力透镜十字架 "/}Image Credit & Copyright: J. Rhoads(Arizona State U.) et al.,WIYN,AURA,NOAO,NSF说明: 大部份的星系只有单一个核心,不过,上面这个星系真的有四个核心吗? 由于这种答案实在太怪异了,让天文学家断言,在这张影像里,根本就看不见这个星系的核心。影像中心的苜蓿叶形天体,实际上是因为前景星系的强大重力场,才把遥远类星体的光,分裂成四个单独的影像。要出现这种类似海市蜃楼的现象,类星体要恰好排列在大质量星系核心的正后方。 这个效应称为重力透镜,而上面这种形态的影像称为爱因斯坦十字架。更有意思的是,这个爱因斯坦十字架的亮度会有变化,会因为前景星系中恒星所造成的重力微透镜效应,亮度偶而会增加。{lamp/}原文:{mtitle title="The Einstein Cross Gravitational Lens"/}Image Credit & Copyright: J. Rhoads(Arizona State U.) et al.,WIYN,AURA,NOAO,NSFExplanation: Most galaxies have a single nucleus -- does this galaxy have four? The strange answer leads astronomers to conclude that the nucleus of the surrounding galaxy is not even visible in this image. The central cloverleaf is rather light emitted from a background quasar. The gravitational field of the visible foreground galaxy breaks light from this distant quasar into four distinct images. The quasar must be properly aligned behind the center of a massive galaxy for a mirage like this to be evident. The general effect is known as gravitational lensing, and this specific case is known as the Einstein Cross. Stranger still, the images of the Einstein Cross vary in relative brightness, enhanced occasionally by the additional gravitational microlensing effect of specific stars in the foreground galaxy.
2017年12月17日
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2016-04-24
2016年04月24日:M16: 恆星诞生之柱-(M16: Pillars of Star Creation)
2016年04月24日:M16: 恆星诞生之柱-(M16: Pillars of Star Creation)--原图下载{mtitle title="M16: 恆星诞生之柱"/}Image Credit: J. Hester, P. Scowen (ASU),HST,NASA说明: 新恒星正诞生于老鹰星云之内。由哈伯太空望远镜摄于1995年的这张影像,呈现了许多"蒸发中的气态云球(EGGs)",刚从分子氢气和尘埃柱之顶端露出来。这些长度约数光年的庞大气柱,密度是如此之高,以至于内部发生引力塌缩形成新的恒星。而在每根云气柱的顶端,年轻亮星发出了强烈的辐射,把云气柱内较低密度的物质蒸发掉,留下了许多内有緻密星蛋的恒星育婴室。老鹰星云与它之内的疏散星团 M16距离地球约有7000光年远。在2007年,史匹哲太望远镜在红外波段再次拍摄这些创生之柱,引发猜测认为一颗发生在该处的超新星或许早已摧毁了这些云柱,只是事件的闪光尚未传到地球而已。{lamp/}原文:{mtitle title="M16: Pillars of Star Creation"/}Image Credit: J. Hester, P. Scowen (ASU),HST,NASAExplanation: Newborn stars are forming in the Eagle Nebula. This image, taken with the Hubble Space Telescope in 1995, shows evaporating gaseous globules (EGGs) emerging from pillars of molecular hydrogen gas and dust. The giant pillars are light years in length and are so dense that interior gas contracts gravitationally to form stars. At each pillars' end, the intense radiation of bright young stars causes low density material to boil away, leaving stellar nurseries of dense EGGs exposed. The Eagle Nebula, associated with the open star cluster M16, lies about 7000 light years away. The pillars of creationwereimaged again in 2007 by the orbitingSpitzer Space Telescope in infrared light, leading to the conjecture that the pillars may already have been destroyed by a local supernova, but lightfrom that event has yet to reach the Earth.
2016年04月24日
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