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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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2023-11-26
2023年11月26日:源自彗星67P表面的尘埃喷流-(A Dust Jet from the Surface of Comet 67P)
2023年11月26日:源自彗星67P表面的尘埃喷流-(A Dust Jet from the Surface of Comet 67P)--原图下载{mtitle title="源自彗星67P表面的尘埃喷流"/}Image Credit: ESA, Rosetta, MPS, OSIRIS;UPD/LAM/IAA/SSO/INTA/UPM/DASP/IDA说明: 彗星的彗尾来自何处呢?在彗星的彗核上,好像没有会发出喷流形成彗尾的特定位置。不过,在2016年欧洲航天局的罗塞塔号太空船,不但拍摄到一道源自彗星67P/丘泽的喷流,而且还直接穿过它。这幅说服力十足的主题影像,呈现了一道明亮的羽状烟尘,从紧贴着一座10米高墙的圆形凹地喷出。分析罗塞塔号的数据证实,这道喷流的组成是尘埃和水冰。这片崎岖不过很单调的原野显示,产生喷流的源头可能远在多孔的表面之下。这幅影像拍摄的时间点,大约在罗塞塔号进行受控撞击彗星67P表面终结任务的前二个月。{lamp/}原文:{mtitle title="A Dust Jet from the Surface of Comet 67P"/}Image Credit: ESA, Rosetta, MPS, OSIRIS;UPD/LAM/IAA/SSO/INTA/UPM/DASP/IDAExplanation: Where do comet tails come from? There are no obvious places on the nuclei of comets from which the jets that create comet tails emanate. In 2016, though, ESA's Rosetta spacecraft not only imaged a jet emerging from Comet 67P/Churyumov-Gerasimenko, but flew right through it. Featured is a telling picture showing a bright plume emerging from a small circular dip bounded on one side by a 10-meter high wall. Analyses of Rosetta data show that the jet was composed of both dust and water-ice.The rugged but otherwise unremarkable terrain indicates that something likely happened far under the porous surface to create the plume. This image was taken about two months before Rosetta's mission ended with a controlled impact onto Comet 67P's surface.
2023年11月26日
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2017-11-06
2017年11月06日:源自彗星67P表面的尘埃喷流-(A Dust Jet from the Surface of Comet 67P)
2017年11月06日:源自彗星67P表面的尘埃喷流-(A Dust Jet from the Surface of Comet 67P)--原图下载{mtitle title="源自彗星67P表面的尘埃喷流"/}Image Credit & Copyright: ESA, Rosetta, MPS, OSIRIS;UPD/LAM/IAA/SSO/INTA/UPM/DASP/IDA说明: 彗星的彗尾来自何处呢?在彗星的彗核上,好像没有会发出喷流形成彗尾的特定位置。不过,在去年欧洲航天局的罗塞塔号太空船,不但拍摄到一道源自彗星67P/丘泽的喷流,而且还直接穿过它。这幅说服力十足的主题影像,呈现了一道明亮的羽状烟尘,从紧贴着一座10米高墙的圆形凹地喷出。分析罗塞塔号的数据证实,这道喷流的组成是尘埃和水冰。这片单调的原野指出,产生喷流的源头可能远在多孔的表面之下。这幅影像摄于去年7月,大约在罗塞塔号进行受控撞击彗星67P表面终结任务的前二个月。{lamp/}原文:{mtitle title="A Dust Jet from the Surface of Comet 67P"/}Image Credit & Copyright: ESA, Rosetta, MPS, OSIRIS;UPD/LAM/IAA/SSO/INTA/UPM/DASP/IDAExplanation: Where do comet tails come from? There are no obvious places on the nuclei of comets from which the jets that create comet tails emanate. Last year, though, ESA's Rosetta spacecraft not only imaged a jet emerging from Comet 67P/Churyumov-Gerasimenko, but flew right through it. Featured is a telling picture showing a bright plume emerging from a small circular dip bounded on one side by a 10-meter high wall. Analyses of Rosetta data shows that the jet was composed of both dust and water-ice.The mundane terrain indicates that something likely happened far under the porous surface to create the plume. This image was taken last July, about two months before Rosetta's mission ended with a controlled impact onto Comet 67P's surface.
2017年11月06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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2012-11-04
2012年11月04日:美国华盛顿州上空的荚状云-(Lenticular Clouds Over Washington)
2012年11月04日:美国华盛顿州上空的荚状云-(Lenticular Clouds Over Washington)--原图下载{mtitle title="美国华盛顿州上空的荚状云"/}Credit &Copyright: Tim Thompson说明: 这些是幽浮吗?不是,它们不过是一群层状的荚状云 (lenticular clouds)。当湿空气被迫往山顶抬升时,有时就会产生荚状云。湿空气温度低于露点时,会凝结成水滴,而成群的小水滴就形成不透光的云。在山峰附近,通常水平运动的气流,会出现垂直方向的运动,而凝结于不同高度的云,就见证了这类的运动。美国.华盛顿州西雅图市 (Seattle),有时就会见到荚状云出现在瑞尼尔山 (Mt. Rainier)附近。瑞尼尔山是西雅图东南方距离不到100公里的一座高山。这张精彩的成群荚状云影像,摄于去年12月。{lamp/}原文:{mtitle title="Lenticular Clouds Over Washington"/}Credit &Copyright: Tim ThompsonExplanation: Are those UFOs near that mountain? No -- they are multilayered lenticularclouds.Moist air forced to flow upwardaround mountain tops can createlenticularclouds.Water droplets condense from moist air cooled below the dew point, and clouds are opaque groups of water droplets.Waves in the air that would normally be seenhorizontally can then be seen vertically, by the different levels where clouds form. On some days the city of Seattle,Washington,USA, istreated to an unusual sky show when lenticular clouds form near Mt. Rainier, a large mountain that looms just under 100 kilometers southeast of thecity.This imageof a spectacular cluster oflenticularclouds was taken in 2008 December.
2012年11月04日
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2010-03-28
2010年03月28日:M16内的恆星诞生柱-(M16: Pillars of Creation)
2010年03月28日:M16内的恆星诞生柱-(M16: Pillars of Creation)--原图下载{mtitle title="M16内的恆星诞生柱"/}Credit: J. Hester, P. Scowen(ASU),HST,NASA说明: 这应是近年来最有名的影像之一。在这张1995年哈伯太空望远镜的影像里,可以看到许多"蒸发中的气态云球"(EGGs)正从巨大氢气和尘埃柱的顶端露出来。这些长度有数光年的巨大气柱,密度非常高,因此内部已经发生重力塌缩,并开始形成新的恒星。位在这些气柱上方的年轻亮星,发出炽热且强烈的辐射,把气柱内较低密度的物质蒸发掉,露出含有许多称为星蛋的恒星育婴室。老鹰星云与及和它关係很紧密的疏散星团--M16距离地球约有7000光年远。最近钱卓X光望远镜对这些气柱进行观测,所获得的影像指出,大多数的星蛋并不是很强的X射线辐射源。{lamp/}原文:{mtitle title="M16: Pillars of Creation"/}Credit: J. Hester, P. Scowen(ASU),HST,NASAExplanation: It has become one of the most famous images of modern times.This image, taken with the Hubble Space Telescope in 1995, shows evaporating gaseous globules (EGGs)emerging from pillars of molecularhydrogen gas anddust.The giant pillars arelight years in lengthand are so dense that interior gas contracts gravitationally to form stars.At each pillars' end,the intense radiation of bright young starscauses low density material to boil away, leavingstellar nurseries of denseEGGs exposed. The Eagle Nebula, associated with theopen star clusterM16, lies about 7000light years away.The pillars of creationwere againimaged by the orbitingChandra X-ray Observatory, and it was found that mostEGGSare not strong emitters ofX-rays.
2010年03月28日
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2009-12-27
2009年12月27日:猫眼星云-(The Cat's Eye Nebula)
2009年12月27日:猫眼星云-(The Cat's Eye Nebula)--原图下载{mtitle title="猫眼星云"/}Credit: J. P. Harrington(U. Maryland) &K. J. Borkowski (NCSU)HST,NASA说明: 在三千光年之外,一颗正走在死亡之途的恒星,抛出一层层壳状的炙热气体。这张由哈伯太空望远镜所拍摄的影像,指出猫眼星云 (Cat's Eye Nebula)可能是已知的行星状星云中最複杂的一个。事实上,猫眼星云的结构是如此的複杂,以致于天文学家猜测星云的中心可能有个双星系统。用行星状星云来称呼这类天体,实在是个很容易引起误解的名称。在小型望远镜中,这类天体具有和行星很像的圆盘状外观,但是高解析度影像,就会解析出它们是被自己吹出气茧所包裹的演化末期恒星。{lamp/}原文:{mtitle title="The Cat's Eye Nebula"/}Credit: J. P. Harrington(U. Maryland) &K. J. Borkowski (NCSU)HST,NASAExplanation: Three thousand light-years away,a dying star throws off shells of glowing gas.This image from theHubble Space Telescope reveals theCat's Eye Nebula to be one of the mostcomplexplanetary nebulae known.In fact, the features seen in theCat's Eyeare so complex that astronomers suspect the brightcentral objectmay actually be abinary star system.The term planetarynebula, used to describe thisgeneral class of objects, is misleading.Although these objects may appear round andplanet-like in small telescopes,high resolution images reveal them to bestars surrounded by cocoons of gas blown off in the late stages ofstellar evolution.
2009年12月27日
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