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2022-05-03
2022年05月03日:水星的钠尾-(Mercury's Sodium Tail)
[2022年05月03日:水星的钠尾-(Mercury's Sodium Tail)--原图下载](https://apod.nasa.gov/apod/image/2205/MercuryTailPleiades_Voltmer_1448.jpg"onMouseOver="if (document.images)document.imagename1.src='image/2205/MercuryTailPleiades_Voltmer_960.jpg';"onMouseOut="if (document.images)document.imagename1.src='image/2205/MercuryTailPleiades_Voltmer_960_annotated.jpg';){mtitle title="水星的钠尾"/}Image Credit & Copyright: Sebastian Voltmer说明: 上面影像中的这种长尾,通常和彗星有紧密的关联;不过,这道长尾并非来自彗星。出现在昴宿星团下方的这颗天体,其实是水星。针对我们太阳系最内围的行星所进行的长曝光摄影,偶而会意外发现它有尾巴。水星稀薄的大气含有少量的钠,而钠在阳光的激发下也发出泛黄的明亮萤光。 除此之外,阳光也会把这些分子从水星表面释放出来,并向后方推送。在这幅于上星期在西班牙.拉帕玛岛,透过纳黄光滤镜拍摄的深空影像里,水星和它的钠尾清楚可见。 远在1980年代即预言存在的水星钠尾,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,曾进一步解析出钠尾的许多细节。{lamp/}原文:{mtitle title="Mercury's Sodium Tail"/}Image Credit & Copyright: Sebastian VoltmerExplanation: That's no comet. Below the Pleiades star cluster is actually a planet: 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 atoms 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 last week from La Palma, Spainthrough 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, of course, are usually associated with comets.
2022年05月03日
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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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2013-08-05
2013年08月05日:地球再见-(Leaving Earth)
2013年08月05日:地球再见-(Leaving Earth)--原图下载2013 August 5 {mtitle title="地球再见"/}Video Credit: NASA/JHU Applied Physics Lab/Carnegie Inst. Washington说明: 离开地球的景像何似?这种场景在八年前,当信使号太空船旋过地球前往内围的水星时,就曾传神且细緻地记录过。在上面这则时序影片中,可见到地球边自转边退至远处的景像;而受阳光照射的地球白昼面过于明亮,致使背景恒星都隐没了。现今,信使号太空船正绕行水星,并且刚完成水星全部表面的照相工作。然而,信使号偶然也会回首眺望地球。信使号是少数建造于地球、离开后永不复返的物体之一;因在信使号任务终结时,它将坠入水星表面。{lamp/}原文:{mtitle title="Leaving Earth"/}Video Credit: NASA/JHU Applied Physics Lab/Carnegie Inst. WashingtonExplanation: What it would look like to leave planet Earth?Such an event was recorded visually in great detail by the MESSENGER spacecraft as it swung back past the Earth, eight years ago, on its way in toward the planet Mercury.Earth can be seen rotating in this time-lapse video, as it recedes into the distance.The sunlit half of Earth is so bright that background stars are not visible.The robotic MESSENGER spacecraft is now in orbit around Mercury and has recently concluded the first complete map of the surface.On occasion, MESSENGER has continued to peer back at its home world.MESSENGER is one of the few things created on the Earth that has left and will never return -- at the end of its mission MESSENGER will be crashed into Mercury's surface.
2013年08月05日
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2013-07-23
2013年07月23日:两个不同视角的地球影像-(Two Views of Earth)
2013年07月23日:两个不同视角的地球影像-(Two Views of Earth)--原图下载{mtitle title="两个不同视角的地球影像"/}Image Credit: Cassini Imaging Team,SSI,JPL,ESA,NASA & NASA/JHU Applied Physics Lab/Carnegie Inst. Washington 说明: 这是行星间的第一次在同一天,从内外太阳系两侧,水星和土星为地球拍照。左边照片是由正在环绕气体巨行星─土星的卡西尼太空船拍的,土星环下的蓝白色小点是地球;右边照片是由正在环绕水星的信使号太空船拍的,地月系统在黑色背景的衬托下特别显眼。在这张信使号拍的照片里,反射太阳光的地球(左边亮点)和月球(右边亮点)明亮地发光着。上週五信使号拍的这张长曝光的照片,其目的有一部份是为了探查这颗太阳系最里面且黯淡的天然卫星─月球。同一天,地球上的人类也为他们自己拍下土星的照片。{lamp/}原文:{mtitle title="Two Views of Earth"/}Image Credit: Cassini Imaging Team,SSI,JPL,ESA,NASA & NASA/JHU Applied Physics Lab/Carnegie Inst. Washington Explanation: In a cross-Solar System interplanetary first, our Earth was photographed during the same day from both Mercury and Saturn.Pictured on the left, Earth is the pale blue dot just below the rings of Saturn, as captured by the robotic Cassini spacecraft now orbiting the gas giant.Pictured on the right, the Earth-Moon system is seen against a dark background, as captured by the robotic MESSENGER spacecraft now orbiting Mercury.In the MESSENGER image, the Earth (left) and Moon (right) shine brightly with reflected sunlight.MESSENGER took the overexposed image last Friday as part of a search for small natural satellites of the innermost planet, moons that would be expected to be quite dim.During this same day, humans across planet Earth snapped many of their own pictures of Saturn.
2013年07月23日
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