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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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欢迎来到人生天地间
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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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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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2020-06-22
2020年06月22日:日环食期间被放大的月球山峰-(Moon Mountains Magnified during Ring of Fire Eclipse)
2020年06月22日:日环食期间被放大的月球山峰-(Moon Mountains Magnified during Ring of Fire Eclipse)--原图下载{mtitle title="日环食期间被放大的月球山峰"/}Image Credit & Copyright: Wang Letian (Eyes at Night)说明: 在这张摄于昨天日食期间的组合影像里,这些暗纹是什么?它们是月缘山峰的倒转的影子。最中间摄于中国.厦门的影像,呈现月亮中心与太阳中心重合的食甚阶段。在此次日食中,月亮离地球太远,而无法遮住整个日盘。因此,阳光从月亮的所有边缘透过来,形成火之环的景观。而在这个系列影像里,环食开始的食既和结束的生光阶段,阳光会从月谷漏出来。而随着月亮从左到右移过日盘,只有较高的月缘山峰,才能挡住阳光。因此这些暗纹,其实是月缘山峰投射的扭曲、倒转及放大影子。影像中的亮区则称为倍里珠。在昨天,只有在东半球的狭窄食带内,才能见到完整的日环食过程。在今年六月,北半球一道狭窄的食带内可见到另一次日环食事件。在年底时,南极洲可见到日全食。{lamp/}原文:{mtitle title="Moon Mountains Magnified during Ring of Fire Eclipse"/}Image Credit & Copyright: Wang Letian (Eyes at Night)Explanation: What are those dark streaks in this composite image of yesterday's solar eclipse?They are reversed shadows of mountains at the edge of the Moon. The center image, captured from Xiamen, China, has the Moon's center directly in front of the Sun's center.The Moon, though, was too far from the Earth to completely block the entire Sun. Light that streamed around all of the edges of the Moon is called a ring of fire.Images at each end of the sequence show sunlight that streamed through lunar valleys. As the Moon moved further in front of the Sun, left to right, only the higher peaks on the Moon's perimeter could block sunlight. Therefore, the dark streaks are projected, distorted, reversed, and magnified shadows of mountains at the Moon's edge. Bright areas are called Baily's Beads.Only a narrow swath across Earth's Eastern Hemisphere was able to see yesterday's full annular solar eclipse.Next June, though, a narrow swath across Earth's Northern Hemisphere will be able to see the next annular solar eclipse. A total solar eclipse will be visible at the bottom of the world near the end of this year.
2020年06月22日
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2017-03-19
2017年03月19日:地球的分点-(Equinox on a Spinning Earth)
2017年03月19日:地球的分点-(Equinox on a Spinning Earth)--原图下载2017 March 19 {mtitle title="地球的分点"/}Image Credit: NASA, Meteosat, Robert Simmon说明: 分隔白画和夜晚的线何时会垂直?明天。地球的春分将在明天降临;在一年中的此时,画夜几乎等长,所以在"分点 (春分或秋分)"之时,地球的明暗界线会垂直连结北极与南极。上面这则时序影片,把地球的一年缩减成12秒来呈现这个景象。这些红外光影像,是由位在地球同步轨道上的气象卫星、在每天同一地方时所拍摄。影片起始于2010年9月的秋分,明暗界线呈垂直指向,而随着地球绕行太阳,明暗界线向右倾斜,导致北半球的日照减少,带来北半球的冬天。随着日子一天天过去,2011年3月的春分在影片中点时降临。接着,明暗界线反向倾侧,带来南半球的冬天和北半球的夏天。在影片中的一年终结于2011年9月的秋分,也终结地球已经绕太阳转数十亿圈的另一次旅程。在未来,这样的旅程也会再发生数十亿次。{lamp/}原文:{mtitle title="Equinox on a Spinning Earth"/}Image Credit: NASA, Meteosat, Robert SimmonExplanation: When does the line between day and night become vertical?Tomorrow.Tomorrow is an equinox on planet Earth, a time of year when day and night are most nearly equal.At an equinox, the Earth's terminator -- the dividing line between day and night -- becomes vertical and connects the north and south poles.The featured time-lapse video demonstrates this by displaying an entire year on planet Earth in twelve seconds.From geosynchronous orbit, the Meteosat satellite recorded these infrared images of the Earth every day at the same local time. The video started at the September 2010 equinox with the terminator line being vertical.As the Earth revolved around the Sun, the terminator was seen to tilt in a way that provides less daily sunlight to the northern hemisphere, causing winter in the north.As the year progressed, the March 2011 equinox arrived halfway through the video, followed by the terminator tilting the other way, causing winter in the southern hemisphere -- and summer in the north.The captured year ends again with the September equinox, concluding another of billions of trips the Earth has taken -- and will take -- around the Sun.
2017年03月19日
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2016-09-14
2016年09月14日:木星的北极区及南极区-(The North and South of Jupiter)
2016年09月14日:木星的北极区及南极区-(The North and South of Jupiter)--原图下载{mtitle title="木星的北极区及南极区"/}Image Credit: NASA, JPL, JunoMission说明: 一个宽广的环形轨道,在8月27日把朱诺号带到木星附近。随着这艘太空船绕过这颗巨行星的极区,朱诺相机所拍下的这些珍贵极区景观,与通常由向外曳航太空船及地基望远镜所拍摄的近赤道视角景观有所区别。木星向阳面的北极区(左),摄于朱诺号最近距前2小时、离云顶约125,000公里之处。右方图板之影像,则是摄于最近南极区后1小时、距离约有94,500公里。和我们很熟悉、环绕赤道区的淡色区与暗带相间景观形成强烈对比的是:极区的云呈迴旋状,有许多交错的正旋和逆迴风暴系统。在朱诺号的任务期间,另外还规划有35次近距离飞越。{lamp/}原文:{mtitle title="The North and South of Jupiter"/}Image Credit: NASA, JPL, JunoMissionExplanation: A wide, looping orbitbrought Juno close to Jupiter on August 27.As the spacecraft swung around the giant planet's polesJunoCamacquired these premier direct polar views,a change from the usual nearly equatorial perspective ofoutbound spacecraft and the telescopes of planet Earth.The sunlit side of Jupiter'snorth polarregion (left) was imaged about125,000 kilometers from the cloud tops, two hours beforeJuno's closest approach.An hour after close approach thesouth polarregion was captured from 94,500 kilometers away.Strikingly different from the alternating light-colored zonesand darker beltsgirdlingmore familiar equatorial regions,the polar region clouds appear more convoluted andmottledby many clockwise and counterclockwise rotating storm systems.Another 35 close orbital flybys are planned during the Juno mission.
2016年09月14日
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2015-09-23
2015年09月23日:南极洲的日行迹-(Antarctic Analemma)
2015年09月23日:南极洲的日行迹-(Antarctic Analemma)--原图下载{mtitle title="南极洲的日行迹"/}Image Credit & Copyright: Adrianos Golemis说明: 太阳每天都会回到天空的同一点吗?不会。此问题较佳也较视觉化的答案是一则日行迹,一种在一年之中,从同一地点同一时间所拍摄影像的组合图。上面这则主题影像,是冒着低温顶着强风在南极Concordia站附近所记录的日行迹。在许多天下午4点所拍摄的这张数位组合影像,咸信是首张南极的日行迹图。影像之所以只呈现9月到3月的太阳位置,缘自其他日子太阳都位在地平面之下。事实上,因为今天是分点,所以南极的太阳是在消失6个月之后首次冒头,然后要到明年3月的春分,日落才会再次降临;当然,如果没受到显着的太气折射效应干扰的话。反过来说,北极在连续6个月阳光普照之后,今天会迎来落日。对地球其他介于南北极之间的区域,"分"意指今天白画和黑夜的长度都是12小时。(analemma 日行迹){lamp/}原文:{mtitle title="Antarctic Analemma"/}Image Credit & Copyright: Adrianos GolemisExplanation: Does the Sun return to the same spot on the sky every day? No. A better and more visual answer to that question is an analemma, a composite image taken from the same spot at the same time over the course of a year.The featured weekly analemma was taken despite cold temperatures and high winds near the Concordia Station in Antarctica.The position of the Sun at 4 pm was captured on multiple days in the digital composite image, believed to be the first analemma constructed from Antarctica.The reason the image only shows the Sun from September to March is because the Sun was below the horizon for much of the rest of the year.In fact, today being an equinox, the Sun rises today at the South Pole after a six month absence and won't set again until the next equinox in March, baring large atmospheric refraction effects.Conversely, today the Sun sets at the North Pole after half a year of continuous daylight.For all of the Earth in between, though, the equinox means that today will have a nighttime and daytime that are both 12 hours long.
2015年09月23日
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2014-05-15
2014年05月15日:航行家探测船的海王星影像-(Voyager's Neptune)
2014年05月15日:航行家探测船的海王星影像-(Voyager's Neptune)--原图下载{mtitle title="航行家探测船的海王星影像"/}Composite Image Credit &Copyright: Assembly/Processing -Rolf Olsen,Data - Voyager 2,NASAPlanetary Data System说明: 在太阳系外围曳航之时,航行家二号探测船在1989年8月25日,航行到最靠近海王星的位置;而它也是造访这颗最外围气态巨行星的唯一人类探测船。上面这幅组合影像,呈现了这颗昏暗的外围行星、最大卫星海卫一和黯淡的行星环系,使用的数据即是来自此次近距接近和之后数天所拍摄之照片。从稍远于海王星轨道的行星际位置回首眺望太阳,除了记录了带着纤细日照眉相的海王星和海卫一之外,也见到海王星南极区的卷云、环绕南极的暗带与南极上空的涡旋云。在航行家飞越之时,也首次拍到部份黯淡的环系及其上头的三段亮弧。在上面这幅组合影像中,最黯淡的行星环区段则是来自模拟(而非实摄)。此外,在这幅跨幅7.5度的影像里,以鹿豹座为中心的背景星场是来自巡天数据,用以复现当时向外飞掠的航行家所见海王星系统的背景。{lamp/}原文:{mtitle title="Voyager's Neptune"/}Composite Image Credit &Copyright: Assembly/Processing -Rolf Olsen,Data - Voyager 2,NASAPlanetary Data SystemExplanation: Cruising through the outer solar system, the Voyager 2spacecraft made its closestapproachto Neptune on August 25, 1989,the only spacecraft to visit the most distantice giant planet.Based on the images recorded during its close encounterand in the following days,this inspired composited scene covers thedim outer planet, largestmoon Triton, and faint system of rings.From just beyond Neptune's orbit, the interplanetary perspectivelooks back toward the Sun, capturingthe planet and Triton as thinsunlit crescents.Cirrus clouds and a dark bandcircle Neptune's south polar region,with a cloudy vortex above the poleitself.Parts of the veryfaint ring system along withthe three bright ring arcs were first imaged by Voyager during thefly-by, though the faintest segments are modeled in thiscomposited picture.Spanning 7.5 degrees, the background starfield is composedfrom sky survey data centered on the constellation Camelopardalis,corresponding to the outbound Voyager's view of themagnificent Neptunian system.
2014年05月15日
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2014-03-19
2014年03月19日:地球的春秋分-(Equinox on a Spinning Earth)
2014年03月19日:地球的春秋分-(Equinox on a Spinning Earth)--原图下载2014 March 19 {mtitle title="地球的春秋分"/}Image Credit: NASA, Meteosat, Robert Simmon说明: 何时分隔白画和夜晚的线会成为垂直?明天。地球的春分将在明天降临,而在一年中的该时,画夜几乎等长,所以在"分 (春分或秋分)"点,地球的明暗界线会垂直连结北极与南极。上面这则时序影片,把地球的一年缩减成12秒来呈现这个景象。这些红外光影像,是由位在地球同步轨道上的气象卫星,在每天同一地方时所拍摄的。影片起始于2010年9月的秋分,明暗界线呈垂直指向,而随着地球绕行太阳,明暗界线向右倾斜,导致北半球的日照减少,带来北半球的冬天。随着日子一天过去,2011年3月的春分在影片中点时降临。接着,明暗界线往反向倾侧,带来南半球的冬天和北半球的夏天。在影片的终点时,2011年9月的秋分来临,终结了地球已绕行太阳数十亿圈的旅程,而在未来,这样的旅程也会再发生数十亿次。{lamp/}原文:{mtitle title="Equinox on a Spinning Earth"/}Image Credit: NASA, Meteosat, Robert SimmonExplanation: When does the line between day and night become vertical?Tomorrow.Tomorrow is an equinox on planet Earth, a time of year when day and night are most nearly equal.At an equinox, the Earth's terminator -- the dividing line between day and night -- becomes vertical and connects the north and south poles.The above time-lapse video demonstrates this by displaying an entire year on planet Earth in twelve seconds.From geosynchronous orbit, the Meteosat satellite recorded these infrared images of the Earth every day at the same local time. The video started at the September 2010 equinox with the terminator line being vertical.As the Earth revolved around the Sun, the terminator was seen to tilt in a way that provides less daily sunlight to the northern hemisphere, causing winter in the north.As the year progressed, the March 2011 equinox arrived halfway through the video, followed by the terminator tilting the other way, causing winter in the southern hemisphere -- and summer in the north.The captured year ends again with the September equinox, concluding another of billions of trips the Earth has taken -- and will take -- around the Sun.
2014年03月19日
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