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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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欢迎来到人生天地间
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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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2022-02-15
2022年02月15日:明暗交界区集成的月亮-(Terminator Moon)
2022年02月15日:明暗交界区集成的月亮-(Terminator Moon)--原图下载{mtitle title="明暗交界区集成的月亮"/}Image Credit: NASA, Lunar Reconnaissance Orbiter, SVS; Processing & Copyright: Jai & Neil Shet说明: 这轮月亮有何不同呢?它是由许多明暗交界区集结而成。不过在这幅主题影像里,你却见不到任何分隔白画与黑夜的明暗交界线。这是因为这幅影像,是由撷取自月面明暗交界线附近的29个长条拼接而成。这些明暗交界线区的暗影最长也最明显,而这些对比鲜明的暗影及其长度,让平面照片变得很立体。用以组成这幅影像的原始照片和数据,是由美国航太总署布署在月亮 附近的月球探勘号轨道船所拍摄。这些数量众多的月表撞击坑(环型山)之所以会很突出,则是因为它们投射的影子都落在右侧。这幅影像很清晰生动的指证,较黝黑名为月海的区域,不但较其他月面黑也较平滑。{lamp/}原文:{mtitle title="Terminator Moon"/}Image Credit: NASA, Lunar Reconnaissance Orbiter, SVS; Processing & Copyright: Jai & Neil ShetExplanation: What's different about this Moon?It's the terminators.In the featured image, you can't directly see any terminator -- the line that divides the light of day from the dark of night.That's because the image is a digital composite of 29 near-terminator lunar strips. Terminator regions show the longest and most prominent shadows -- shadows which, by their contrast and length, allow a flat photograph to appear three-dimensional.The original images and data were taken near the Moon by NASA's Lunar Reconnaissance Orbiter. Many of the Moon's craters stand out because of the shadows they all cast to the right.The image shows in graphic detail that the darker regions known as maria are not just darker than the rest of the Moon -- they are flatter.
2022年02月15日
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2021-02-13
2021年02月13日:爱神星的立体影像-(Stereo Eros)
2021年02月13日:爱神星的立体影像-(Stereo Eros)--原图下载{mtitle title="爱神星的立体影像"/}Image Credit: NEAR Project,JHU APL,NASA说明: 请取出你的红/蓝眼镜,体验漂浮在阋神星(433 Eros)旁边的感受。每1.8年绕行太阳一圈的这颗近地小行星,是以希腊神话的爱神为名。虽然如此,它的形状其实较像马铃薯而非爱心。长40公里、宽14公里、高14公里的这颗小天体,是个由起伏地平线、撞击坑、巨石和低谷聚成的世界。它的尺寸及很不浪漫的形状,在这幅由NEAR舒梅克卫星拍摄的照片合成之立体拼接影像里清楚可见。在这幅表面图里,NEAR舒梅克卫星的影像,为它的地形、结构及这颗都市大小的太阳系小天体,提供重要的量测数据。影像里,可解析的最小结构约为30公尺。从2000年2月14日起,NEAR舒梅克卫星以一年的时间绕行爱神星,成为首艘绕行小行星的地球太空船。而在2001年2月12日,它着陆在爱神星表面,成为首艘着陆在小行星的探测船。在2001年2月28日,NEAR舒梅克卫星最一次从爱神星表面回传讯息。{lamp/}原文:{mtitle title="Stereo Eros"/}Image Credit: NEAR Project,JHU APL,NASAExplanation: Get out yourred/blue glassesand float next toasteroid 433 Eros.Orbiting the Sun once every 1.8 years, the near-Earth asteroidis named for the Greek god of love.Still, its shape more closely resembles a lumpy potato than a heart.Eros is a diminutive 40 x 14 x 14 kilometer world of undulating horizons,craters, boulders and valleys.Its unsettling scale and unromantic shape are emphasized inthis mosaicof images from the NEAR Shoemaker spacecraftprocessed to yield a stereo anaglyphic view. Along with dramaticchiaroscuro,NEAR Shoemaker's 3-D imaging provided important measurementsof the asteroid's landforms and structures, andclues to the origin of thiscity-sized chunk of Solar System.The smallest features visible here are about 30 meters across.Beginning on February 14, 2000, historic NEAR Shoemakerspent a year in orbit around Eros,the first spacecraft to orbit an asteroid.Twenty years ago, on February 12 2001, it landed on Eros,the first ever landing on an asteroid's surface.NEAR Shoemaker'sfinal transmission from the surface of Eros was onFebruary 28, 2001.
2021年02月13日
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2015-04-27
2015年04月27日:月亮明暗界线上方的太空站-(Space Station over Lunar Terminator)
2015年04月27日:月亮明暗界线上方的太空站-(Space Station over Lunar Terminator)--原图下载{mtitle title="月亮明暗界线上方的太空站"/}Image Credit & Copyright: Dani Caxete说明: 位在月亮前方的天体是啥?国际太空站是也。有赖精密的定时,得在这个月初拍到绕地太空平台悬在半明半暗的月盘前方。而这幅摄于西班牙.马德里的主题影像,曝光时间只有短短的千分之一秒;相较之下,国际太空站淩越整个月盘大约需要半秒钟。在阳光中发出亮闪的太空站,出现在明暗界线稍左方的暗面之上。此外,影像中尚可看到数量众多的环形山、崎岖的淡色高原月貌、以及相对平滑的暗色月海。线上的工具能告诉你,何时可在你的区域见到国际太空站。{lamp/}原文:{mtitle title="Space Station over Lunar Terminator"/}Image Credit & Copyright: Dani CaxeteExplanation: What's that in front of the Moon?It's the International Space Station.Using precise timing, the Earth-orbiting space platform was photographed in front of a partially lit Moon last year.The featured image was taken from Madrid, Spain with an exposure time of only 1/1000 of a second.In contrast, the duration of the transit of the ISS across the entire Moon was about half a second. The sun-glinting station can be seen just to the dark side of the day / night line known as the terminator.Numerous circular craters are visible on the distant Moon, as well as comparatively rough, light colored terrain known as highlands, and relatively smooth, dark colored areas known as maria. On-line tools can tell you when the International Space Station will be visible from your area.
2015年04月27日
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2014-02-09
2014年02月09日:系川小行星失蹤的陨石坑-(The Missing Craters of Asteroid Itokawa)
2014年02月09日:系川小行星失蹤的陨石坑-(The Missing Craters of Asteroid Itokawa)--原图下载{mtitle title="系川小行星失蹤的陨石坑"/}Image Credit & Copyright: ISAS,JAXA说明: 系川小行星 (asteroid Itokawa)上的陨石坑都跑到那儿去了?它们意外地都失蹤了。 日本的探测船鹰隼号在2005年接近这颗会与地球交错的小行星时,所回传的照片显示,这颗小行星的表面和过往已拍照的任何一个太阳系天体都不同--它的表面缺乏陨石坑。解释为何它表面缺乏常见圆形撞击凹洞的最主要理论认为,系川小行星是一个碎石堆,是一团被微弱重力勉强聚在一起的岩石和冰块。若果真如此,陨石坑可能不容易形成,或者它们可能在小行星每次通过大行星时或被大流星撞击时,所引发的震动给填满了。近来在地表观测系川小行星得到了一项意外发现:部分小行星内部的平均密度高于其他部分。鹰隼号任务所带回来的系川小行星土壤採样,将提供了解这颗不寻常小行星和整个太阳系远古历史的线索。{lamp/}原文:{mtitle title="The Missing Craters of Asteroid Itokawa"/}Image Credit & Copyright: ISAS,JAXAExplanation: Where are the craters on asteroid Itokawa? Missing -- unexpectedly. The Japanese robot probe Hayabusa approached the Earth-crossing asteroid in 2005 and returned pictures showing a surface unlike any other Solar System body yet photographed -- a surface possibly devoid of craters. The leading hypothesis for the lack of common circular indentations is that asteroid Itokawa is a rubble pile -- a bunch of rocks and ice chunks only loosely held together by a small amount of gravity. If so, craters might not form so easily -- or be filled in whenever the asteroid gets jiggled by a passing planet or struck by a massive meteor. Recent Earth-based observations of asteroid Itokawa have shown that one part of the interior even has a higher average interior density than the other part, another unexpected discovery. The Hayabusa mission returned soil samples from Itokawa which are also giving clues the ancient history of the unusual asteroid and our entire Solar System.
2014年02月09日
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2012-03-20
2012年03月20日:月球的演变-(Evolution of the Moon)
2012年03月20日:月球的演变-(Evolution of the Moon)--原图下载2012 March 20 {mtitle title="月球的演变"/}Video Credit: LRO,SVC,NASA说明: 这月球到底是甚么来历呢?似乎是在45亿年前,当地球受到火星大小物体撞击时,飞溅的碎片撞击而成。如同这段模拟影像,在重力冷却后,这发光的月球表面渐渐降温且崩裂。大大小小的石块不断地打到月球上,包含了43亿年前造成艾肯特盆地的那次剧烈撞击。然而,持续了数十亿年的大撞击期间(Heavy Bombardment),在表面上更造成数个大型盆地,尔后的数十亿年,对着地球这面的盆地上,火山岩流蔓延,最后冷却成如今我们所看见的黑色月球海。一如既往,在最近这十亿年慢慢减缓的撞击,产生了今日所见到的陨石坑。如今我们热爱的冰冷且如黑炭一样的月球,总是以同一面对着地球。然而,月球的起源究竟是如何呢?以及为什么月球海只存在对着地球的这面呢?这还需要更多的研究探讨。{lamp/}原文:{mtitle title="Evolution of the Moon"/}Video Credit: LRO,SVC,NASAExplanation: What is the history of the Moon?The Moon was likely created fromdebris expelled when a Mars-sized object violentlyimpacted the Earth about 4.5 billion years ago.Just after gravitationally condensing, asimaginedabove, the glowing-hot surface of the Moon cooled and cracked.Rocks large and small continued to impact the surface, including a particularly large impact that createdAitken Basin about 4.3 billion years ago.A Heavy Bombardment period then continued for hundreds of millions of years, creating large basins all over the lunar surface.Over the next few billion years lava flowed intoEarth-side basins, eventually cooling into the dark maria we see today. As always, relentless impacts continued, forming thecraters we see today, slowly diminishing over the past billion years.Today the cooled Moon we know andloveis as dark as coal and always keeps the same face toward Earth.Exactly how theMoon formed initially, and whylunar maria are only on the Earth side, remain active topics of research.
2012年03月20日
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2011-09-19
2011年09月19日:灶神星的南端-(The South Pole of Asteroid Vesta)
2011年09月19日:灶神星的南端-(The South Pole of Asteroid Vesta)--原图下载{mtitle title="灶神星的南端"/}Image Credit: NASA, JPL-Caltech, UCLA, MPS, DLR, IDA说明: 灶神星南端的环型结构是怎么产生的?上个月,黎明号太空船抵达小行星带,成为首颗绕行这个排名第二小行星的太空船。这张影像解析度高达260公尺,灶神星上的丘陵、陨石坑、还有断崖都清晰可见,还有其他分布在这颗直径500公里小行星右下方的表面陨石坑上,粗糙环形特徵都是清清楚楚。先前研究指出,这样的特徵是因为碰撞合併了一颗较小的小行星。其他的可能则为,这些特徵可能就在小行星形成后不久,由于内部过程而产生的。随着黎明号太空船持续地螺旋靠近这颗小行星,未来几个月将会纪录下更高解析度的影像,可能会提供新的线索。{lamp/}原文:{mtitle title="The South Pole of Asteroid Vesta"/}Image Credit: NASA, JPL-Caltech, UCLA, MPS, DLR, IDAExplanation: What created the circular structure around the south pole of asteroid Vesta?Pictured above, the bottom of the second largest object in the asteroid belt was recently imaged for the first time by the robotic Dawn satellite that arrived last month.A close inspection of the 260-meter resolution image shows not only hills and craters and cliffs and more craters, but ragged circular features that cover most of the lower right of the 500-kilometer sized object.Early speculation posits that the structure might have been created by a collision and coalescence with a smaller asteroid.Alternatively, the features might have originated in an internal process soon after the asteroid formed.New clues might come in the next few months as Dawn spirals down toward the rocky world and obtains images of increasingly high resolution.
2011年09月19日
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