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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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2020-07-08
2020年07月08日:水星的钠尾-(Mercury's Sodium Tail)
2020年07月08日:水星的钠尾-(Mercury's Sodium Tail)--原图下载{mtitle title="水星的钠尾"/}Image Credit & Copyright: Andrea Alessandrini说明: 从水星伸出的弥漫条纹是什么?对我们太阳系最内围的行星进行的长曝光观测,发现了一个出乎意料的景观:它长尾巴!阳光会把各种分子,从水星的表面蒸发出来并推送出去。所形成的水星稀薄大气含有少量的钠,并在阳光的激发下发出相对明亮的泛黄辉光。上面这幅今年5月底在义大利,透过纳黄光滤镜拍摄的深空影像,水星和它的钠尾清楚可辨。远在1980年代即预言存在的水星钠尾,其实直到2001年才首次观测到。美国航太总署.信使号太空船在2011年到2015年绕行水星时进行的多次观测,进一步解析出钠尾的许多细节。说到尾部结构,常会让我们联想起彗星,而在目前的夜晚里,用双筒望远镜可见到NEOWISE彗星的彗尾。{lamp/}原文:{mtitle title="Mercury's Sodium Tail"/}Image Credit & Copyright: Andrea AlessandriniExplanation: What is that fuzzy streak extending from Mercury?Long exposures of our Solar System's innermost planet may reveal something unexpected: a tail.Mercury's thin atmosphere contains small amounts of sodium that glow when excited by light from the Sun.Sunlight also liberates these molecules from Mercury's surface and pushes them away.The yellow glow from sodium, in particular, is relatively bright. Pictured, Mercury and its sodium tail are visible in a deep image taken in late May from Italy through a filter that primarily transmits yellow light emitted by sodium.First predicted in the 1980s, Mercury's tail was first discovered in 2001.Many tail details were revealed in multiple observations by NASA's robotic MESSENGER spacecraft that orbited Mercury between 2011 and 2015. Tails are usually associated with comets. The tails of Comet NEOWISE are currentlyvisible with the unaided eye in the morning sky.
2020年07月08日
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2017-07-23
2017年07月23日:信使号所拍摄的水星-(Mercury as Revealed by MESSENGER)
2017年07月23日:信使号所拍摄的水星-(Mercury as Revealed by MESSENGER)--原图下载{mtitle title="信使号所拍摄的水星"/}Image Credit: MESSENGER,NASA,JHU APL, CIW说明: 这是前所未见的水星。在2008年,无人的信使号太空船第二次掠过水星,并且拍下了先前只有相对粗糙地面雷达影像的区域之影像。在这张由信使号在通过90分钟后转头从27,000公里之外所拍下的主题影像里,可见到许多第一次看到的表面特徵,包括从临边一个年轻撞击坑射出、形似经度 子午线的不寻常颀长辐线。信使号在2011年入轨水星,并在2012年结束主要任务,不过一直进行细部观测到2015年,当它耗尽燃料接到指令撞击水星表面方止。{lamp/}原文:{mtitle title="Mercury as Revealed by MESSENGER"/}Image Credit: MESSENGER,NASA,JHU APL, CIWExplanation: Mercury had never been seen like this before. In 2008, the robotic MESSENGER spacecraft buzzed past Mercury for the second time and imaged terrain mapped previously only by comparatively crude radar. The featured image was recorded as MESSENGER looked back 90 minutes after passing, from an altitude of about 27,000 kilometers.Visible in the image, among many other newly imaged features, are unusually long rays that appear to run like meridians of longitude out from a young crater near the northern limb. MESSENGER entered orbit around Mercury in 2011 and finished its primary mission in 2012, but took detailed measurements until 2015, at which time it ran out of fuel and so was instructed to impact Mercury's surface.
2017年07月23日
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2015-05-05
2015年05月05日:水星的引力异常区-(Gravitational Anomalies of Mercury)
2015年05月05日:水星的引力异常区-(Gravitational Anomalies of Mercury)--原图下载{mtitle title="水星的引力异常区"/}Image Credit: NASA, GSFC's SVS,JHU's APL,Carnegie Inst. Washington说明: 水星表面之下有什么?在过去4年之中,无人驾驶的信使号太空船不停地绕行水星,并用能量极为精确的电波把数据回传到地球。然而,这颗行星的引力微量地改变了回传电波的能量,也让科学家得以建构出精确度前所未见的引力图;如上面这幅叠合着以假色渲染的引力异常区之坑坑凹凹水星表面图所示。其中,泛红色泽标出引力较高的区域,这也标示出表面之下定然藏着不寻常緻密物质的区域。影像中心的巨大撞击坑,则是宽达1,500公里的卡洛里盆地。在完成任务、几乎耗尽燃料之后,信使号故意在上星期撞上水星表面。{lamp/}原文:{mtitle title="Gravitational Anomalies of Mercury"/}Image Credit: NASA, GSFC's SVS,JHU's APL,Carnegie Inst. WashingtonExplanation: What's that under the surface of Mercury?The robotic MESSENGER spacecraft that had been orbiting planet Mercury for the past four years had been transmitting its data back to Earth with radio waves of very precise energy. The planet's gravity, however, slightly changed this energy when measured on Earth, which enabled the reconstruction of a gravity map of unprecedented precision. Here gravitational anomalies are shown in false-color, superposed on an image of the planet's cratered surface.Red hues indicate areas of slightly higher gravity, which in turn indicates areas that must have unusually dense matter under the surface.The central area is Caloris Basin, a huge impact feature measuring about 1,500 kilometers across.Last week, after completing its mission and running low on fuel, MESSENGER was purposely crashed onto Mercury's surface.
2015年05月05日
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2013-06-12
2013年06月12日:水星的全貌-(All of Mercury)
2013年06月12日:水星的全貌-(All of Mercury)--原图下载2013 June 12 {mtitle title="水星的全貌"/}Image Credit: NASA/JHU Applied Physics Lab/Carnegie Inst. Washington说明: 这是第一次绘製出水星表面的全貌。对这颗内行星令人惊奇的地壳面貌的精细观测,自2008年信使号第一次飞掠水星,至2011年进入水星轨道开始绕水星运行,持续进行着。早期,受限于水星离地球的距离太远,以致无法使地面望远镜观测,水星的面貌一直是未知的谜;直到水手十号在1970年代飞掠水星,才观测到水星的半个面貌。这部影片使用数千张水星影像编辑而成,使用多个色彩泫染,使不同的地表特性有个对照。在这旋转的世界里,先看到的是多条自北方撞击处延伸出的放射线,几乎横跨整个水星;当影片进行至一半时,使用明亮色彩着色的卡洛里盆地就此现身,这个充满岩浆的盆地产生自久远年代前的一次撞击。信使号目前成功地执行首要任务与第一次延伸任务。{lamp/}原文:{mtitle title="All of Mercury"/}Image Credit: NASA/JHU Applied Physics Lab/Carnegie Inst. WashingtonExplanation: For the first time, the entire surface of planet Mercury has been mapped.Detailed observations of the innermost planet's surprising crust have been ongoing since the robotic MESSENGER spacecraft first passed Mercury in 2008 and began orbiting in 2011.Previously, much of the Mercury's surface was unknown as it is too far for Earth-bound telescopes to see clearly, while the Mariner 10 flybys in the 1970s observed only about half.The above video is a compilation of thousands of images of Mercury rendered in exaggerated colors to better contrast different surface features.Visible on the rotating world are rays emanating from a northern impact that stretch across much of the planet, while about half-way through the video the light colored Caloris Basin rotates into view, a northern ancient impact feature that filled with lava.MESSENGER has now successfully completed its primary and first extended missions.
2013年06月12日
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2012-03-27
2012年03月27日:水星上发现异常凹陷-(Unusual Hollows Discovered on Planet Mercury)
2012年03月27日:水星上发现异常凹陷-(Unusual Hollows Discovered on Planet Mercury)--原图下载{mtitle title="水星上发现异常凹陷"/}Image Credit: NASA/<ahref="http://www.jhuapl.edu/">JHU APL/<ahref="http://www.ciw.edu/">CIW说明: 水星上这些异常的特徵是甚么?信使号太空船最近绕行水星时,拍下这张以淡蓝色强化的坑洞影像。圆形洼地与其他的撞击陨石坑不大一样,併没有像是月亮或是其他太阳系内陨石坑的特徵。这张影像所拍的是Raditladi陨石坑,宽约40公里,中央可见山脉的峰顶。目前领先的理论认为,当剧烈撞击造成Raditladi陨石坑的时候,物质受到加热昇华而产生这样的凹陷结构。美国太空总署的信使号太空船是第一个公转水星的卫星,并且还计画探索太阳系内部直到2013年。{lamp/}原文:{mtitle title="Unusual Hollows Discovered on Planet Mercury"/}Image Credit: NASA/<ahref="http://www.jhuapl.edu/">JHU APL/<ahref="http://www.ciw.edu/">CIWExplanation: What are those unusual features on planet Mercury?The slightly bluish tinge of features dubbed hollows has been exaggerated on the above image by the roboticMESSENGER spacecraft currentlyorbiting Mercury.The rounded depressions appear different than impact craters and nothing like them has been noted onEarth's Moon or anywhere else in theSolar System.The above image is a section of the floor ofRaditladiimpact basin about 40 kilometers wide that includes the mountains of the central peak. One progenitor hypothesis is that the hollows formed from thesublimation ofmaterial exposedand heated during the violent impact that created theRaditladi basin.NASA's MESSENGERis the first spacecraft ever to orbit Mercury, and iscurrently scheduledto explore the Solar System's innermost planet into 2013.
2012年03月27日
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2011-06-16
2011年06月16日:色泽经过夸饰的水星表面-(Mercury's Surface in Exaggerated Color)
2011年06月16日:色泽经过夸饰的水星表面-(Mercury's Surface in Exaggerated Color)--原图下载{mtitle title="色泽经过夸饰的水星表面"/}Credit: NASA/<ahref="http://www.jhuapl.edu/">JHU APL/<ahref="http://www.ciw.edu/">CIW说明: 信使号探测船最近刚绕行水星满100圈。同时信使号的相机组,在可见光到近红外光等8个不同颜色的波段,仔细地记录了许多影像,用以探索这颗太阳系最内围行星的表面组成,以及它过去的历史和演化之迹证。这幅清晰影像组合了信使号广角相机三个颜色的照片,不过其中的颜色经过夸饰。否则的话,在人类的肉眼中,水星表面的色泽会显得相当单调。这张跨幅约有1,000公里的影像,以原来的解析度呈现了一公里以上的水星表面结构。在今天,信使号计画办公室,将发布首颗绕行水星的太空船回传之新影像和科学发现。{lamp/}原文:{mtitle title="Mercury's Surface in Exaggerated Color"/}Credit: NASA/<ahref="http://www.jhuapl.edu/">JHU APL/<ahref="http://www.ciw.edu/">CIWExplanation: The roboticMESSENGER spacecraftrecently completed over100 orbits ofMercury.MESSENGER's cameras have recordeddetailed pictures utilizing eight different colors acrossvisible and nearinfrared light, exploring the surfacecomposition and looking for clues to the history and evolutionof the solar system's innermost planet.This sharpimage combines three of the MESSENGER wide angle camera's colors,but in exaggerated fashion.Otherwise, to the unaided human eye, Mercury's surface colors would appearcomparatively muted.The image is about 1,000 kilometers across andfeatures as small as a single kilometer are discernible at the originalresolution.Today, the MESSENGER projectwill release new images and science findings from thefirst spacecraft to orbit Mercury.
2011年06月16日
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