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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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2023-12-04
2023年12月04日:飞机凌越新月-(Plane Crossing Crescent Moon)
2023年12月04日:飞机凌越新月-(Plane Crossing Crescent Moon)--原图下载{mtitle title="飞机凌越新月"/}Image Credit & Copyright: Juned Patel说明: 上图的弦月不是弓,也没把飞机射出如箭。这只是一次意外重合的产物。飞机的凝结尾通常呈白色,但在冉冉升起朝日方向的大量空气,选择性的消去了阳光的蓝光,不但造就了蓝天,而且也把反射阳光的凝结尾染成亮红色。而在飞机远后方的新月,也稍微偏红。这幅在上个月初摄于英国 博尔顿市的主题影像,取像的时间点紧在日落之后,因此照耀飞机及凝结尾的阳光来自下方。令人遗憾的是,在拍照的数分钟之后,这场即兴的天空演出就落幕了。飞机远离视线而去,天空愈来愈明亮,让持续升起的月亮变得难以辨认,而凝结尾也逐渐消散。{lamp/}原文:{mtitle title="Plane Crossing Crescent Moon"/}Image Credit & Copyright: Juned PatelExplanation: No, the Moon is not a bow, and no, it did not shoot out a plane like an arrow.What is pictured is a chance superposition. The plane's contrail would normally appear white, but the large volume of air toward the rising Sun preferentially knocked away blue light, not only making the sky blue, but giving the reflected trail a bright red hue. Far in the distance, well behind the plane, the crescent Moon also appears slightly reddened.Captured early last month from Bolton, UK, the featured image was taken so soon after sunrise that the plane was sunlit from below, as was its contrail. Within minutes, unfortunately, the impromptu sky show ended. The plane moved out of sight. The Moon kept rising but became harder to see through a brightening sky. And the contrail gradually dispersed.
2023年12月04日
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2022-09-18
2022年09月18日:秋分: 卡拉尼希巨石阵上空的日行迹-(Analemma over the Callanish Stones)
[2022年09月18日:秋分: 卡拉尼希巨石阵上空的日行迹-(Analemma over the Callanish Stones)--原图下载](https://apod.nasa.gov/apod/image/2209/CallanishAnalemma_Petricca_1280.jpg"onMouseOver="if (document.images)document.imagename1.src='image/2209/CallanishAnalemma_Petricca_960_Dates.jpg';"onMouseOut="if (document.images)document.imagename1.src='image/2209/CallanishAnalemma_Petricca_960.jpg';){mtitle title="秋分: 卡拉尼希巨石阵上空的日行迹"/}Image Credit & Copyright: Giuseppe Petricca说明: 如果你每天在相同的时间到走出门外,拍摄一张捎带太阳的照片,那么太阳在一年之中的位置会如何变化?此问题视觉化的答案是一个日行迹,一种在一年之中,从同一地点同一时间所拍摄的影像之组合图。上面这张日行迹主题影像,是在英国.苏格兰.外赫布里底群岛的卡拉尼希村,每隔数天的下午4点拍摄的照片组合而成。影像前景的卡拉尼希 巨石阵,是在人类青铜器时代、纪元前2700年左右建造的巨石阵。不过,目前仍然不清楚卡拉尼希巨石阵的排列,在现在或过去是否有任何天文学的意涵。造就这个8字形及其他日行迹的真正原因,是倾侧的地轴和地球绕太阳公转轨道的椭圆率。在夏、冬至时,太阳分别位在日行迹的顶端和底端,而春、秋分则在日行迹的中间(非交叉点)附近。今年的秋分将在下星期五的世界时1:04 UT(+8时区为9月23日09:04)降临 ,届时世界各地所见到的白画和夜晚皆等长。许多文明会在季节更迭的分点时举行庆典。(analemma 日行迹; Callanish Stones 卡拉尼希巨石阵){lamp/}原文:{mtitle title="Analemma over the Callanish Stones"/}Image Credit & Copyright: Giuseppe PetriccaExplanation: If you went outside at the same time every day and took a picture that included the Sun, how would the Sun's position change? A 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 analemma was composed from images taken every few days at noon near the village of Callanish in the Outer Hebrides in Scotland, UK. In the foreground are the Callanish Stones, a stone circle built around 2700 BC during humanity's Bronze Age. It is not known if the placement of the Callanish Stones has or had astronomical significance. The ultimate causes for the figure-8 shape of this and all analemmas are the tilt of the Earth axis and the ellipticity of the Earth's orbit around the Sun. At the solstices, the Sun will appear at the top or bottom of an analemma.The featured image was taken near the December solstice and so the Sun appears near the bottom. Equinoxes, however, correspond to analemma middle points -- not the intersection point.This coming Friday at 1:04 am (UT) -- Thursday in the Americas -- is the equinox ("equal night"), when day and night are equal over all of planet Earth.Many cultures celebrate a change of season at an equinox.
2022年09月18日
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2022-03-08
2022年03月08日:反色的月亮-(Moon in Inverted Colors)
2022年03月08日:反色的月亮-(Moon in Inverted Colors)--原图下载{mtitle title="反色的月亮"/}Image Credit & Copyright: Dawid Glawdzin说明: 这是那颗卫星呢?它是月亮,只是颜色经过反转而已。在这幅影像里,与淡色与暗色对应的像素值经过反转(或反色),所製作出的假色影像酷似黑白照片的负片。话虽如此,它是个如假包换的反色影像,其中月亮的淡色区是真的,只是先经过数位夸大然后才反转。所以月面南缘(影像底部)源自85公里直径第谷坑的明亮辐线,成为从此撞击坑射出、轻易可辨的暗绿色线纹。而在这幅摄于英国.英格兰.滨海绍森德市的影像里,通常很黝黑的月海,反而变成银白色。在历史上,使用照像底板记录的天文影像,通常会直接在反色负片底板进行检视,因为肉眼反而较容易认出暗淡的结构细节。{lamp/}原文:{mtitle title="Moon in Inverted Colors"/}Image Credit & Copyright: Dawid GlawdzinExplanation: Which moon is this?It's Earth's moon -- but in inverted colors.Here, the pixel values corresponding to light and dark areas have been translated in reverse, or inverted, producing a false-color representation reminiscent of a black and white photographic negative. However, this is an inverted color image -- where the muted colors of the moon are real but digitally exaggerated before inversion. Normally bright rays from the large crater Tycho dominate the southern (bottom) features as easily followed dark green lines emanating from the 85-kilometer diameter impact site. Normally dark lunar mare appear light and silvery. The image was acquired in Southend-on-Sea, England, UK. Historically, astronomical images recorded on photographic plates were directly examined on inverted-color negatives because it helped the eye pick out faint details.
2022年03月08日
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2021-11-30
2021年11月30日:移过天空的天王星和卫星-(In Motion: Uranus and Moons)
2021年11月30日:移过天空的天王星和卫星-(In Motion: Uranus and Moons)--原图下载2021 November 30 {mtitle title="移过天空的天王星和卫星"/}Video Credit: David Campbell (U. Hertfordshire), Bayfordbury Observatory说明: 移过天空的是什么?是太暗肉眼不得见的天王星。这部影片记录了这颗位在土星外头的气态巨行星,这个月稍早运行到“天王星冲”附近,于最靠近地球也因此最明亮时的身影。这部原始长度为4小时,呈现天王星和4颗大卫星:天卫三、天卫四、天卫二、和天卫一的缩时主题影片,则是摄于英国.赫特福德郡的贝佛贝瑞 天文台。天王星移过背景恒星前方的视运动,主要来自地球绕太阳公转的轨道运动。以天王星为中心的星芒,其实是源自它的光,在通过这座望远镜一面镜子的4道支撑臂时,所产生的绕射芒。而绕射芒的转动,并非来自天王星的自转,而是源自地球的自转。在接下来的数个月里,天王星用双筒望远镜即可见,不过要看到它的卫星,则必需借助于望远镜。(Titania 天卫三; Oberon 天卫四; Umbriel 天卫二; Ariel 天卫一){lamp/}原文:{mtitle title="In Motion: Uranus and Moons"/}Video Credit: David Campbell (U. Hertfordshire), Bayfordbury ObservatoryExplanation: What's that moving across the sky?A planet just a bit too faint to see with the unaided eye: Uranus.The gas giant out past Saturn was tracked earlier this month near opposition -- when it was closest to Earth and at its brightest.The featured video captured by the Bayfordbury Observatory in Hertfordshire, UK is a four-hour time-lapse showing Uranus with its four largest moons in tow: Titania, Oberon, Umbriel and Ariel.Uranus' apparent motion past background stars is really dominated by Earth's own orbital motion around our Sun.The cross seen centered on Uranus is called a diffraction spike and is caused by light diffracting around the four arms that hold one of the telescope's mirrors in place. The rotation of the diffraction spikes is not caused by the rotation of Uranus but, essentially, by the rotation of the Earth.During the next few months Uranus itself will be visible with binoculars, but, as always, to see its moons will requirea telescope.
2021年11月30日
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2020-07-14
2020年07月14日:巨石阵上空的NEOWISE彗星-(Comet NEOWISE over Stonehenge)
2020年07月14日:巨石阵上空的NEOWISE彗星-(Comet NEOWISE over Stonehenge)--原图下载{mtitle title="巨石阵上空的NEOWISE彗星"/}Image Credit & Copyright: Declan Deval说明: 看过彗星吗?大好机会就在今晚,或者接下来的数晚。请在刚日落后走出屋外,然后往西北方看。该方向的地平线越低平的地方,越有机会。透过双筒望远镜看或许较容易,不过如你所在之处清朗无云又幽暗,那你所需要的只是肉眼和一点耐心。等日落后,天空会逐渐变暗,然后试着找斜指向地平线的暗淡线形光痕,那就是NEOWISE彗星。它是一个来自太阳系外围不停蒸发中的5公里宽髒冰堡,目前正踏上归程。不过随着地球自转,这颗彗星不久就会西沈,所以记得拍照留念。这幅主题影像里的NEOWISE彗星(C/2020 F3),是在2天前的清晨悬在英国.巨石阵的上空。由美国航太总署.NEOWISE巡天卫星在今年3月发现的NEOWISE彗星,出乎许多人的预期,在近距离掠过太阳后残存了下来,而且大幅增亮并发展出非常吸睛的离子尾(蓝)和尘埃(白)。{lamp/}原文:{mtitle title="Comet NEOWISE over Stonehenge"/}Image Credit & Copyright: Declan DevalExplanation: Have you ever seen a comet?Tonight -- and likely the next few nights -- should be a good chance.Go outside just at sunset and look to your northwest. The lower your horizon, the better. Binoculars may help, but if your sky is cloudless and dark, all you should need is your unaided eyes and patience.As the Sun sets, the sky will darken, and there will be an unusual faint streak pointing diagonally near the horizon.That is Comet NEOWISE.It is a 5-kilometer-wide evaporating dirty iceberg visiting from -- and returning to -- the outer Solar System.As the Earth turns, the comet will soon set, so you might want to take a picture.In the featured image, Comet C/2020 F3 (NEOWISE) was captured two mornings ago rising over Stonehenge in the UK. Discovered with the NASA satellite NEOWISE toward the end of March, Comet NEOWISE has surprised many by surviving its closest approach to the Sun, brightening dramatically, and developing impressive (blue) ion and (white) dust tails.
2020年07月14日
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2020-06-08
2020年06月08日:金星的大气-(Atmospheric Ring of Venus)
2020年06月08日:金星的大气-(Atmospheric Ring of Venus)--原图下载{mtitle title="金星的大气"/}Image Credit & Copyright: Pete Lawrence (Digital Sky)说明: 为什么金星旁边镶着一圈亮环?因为阳光从这个天体的周围透射过来,所以形成这种或称为火之环的景观。火之环通常在日环食期间最常出现在月盘的周围,而金星或水星 淩日时也会出现这种景观。在上星期拍摄这幅主题影像时,金星其实并未直接通过太阳前方,不过阳光还是受到金星厚重大气 折射造成了这圈环拱金星的亮环。在这次的下合事件里,从夜晚移向清晨天空的金星,于下合的位置时,它与太阳的间距小于1度。在极端明亮的太阳旁拍摄这种影像的难度极高,之所以能在英国.莱斯特郡.桑顿村取得这张影像,是因为滤镜暂时遮住了直射的阳光。影像中无所不在的蓝天辉光{lamp/}原文:{mtitle title="Atmospheric Ring of Venus"/}Image Credit & Copyright: Pete Lawrence (Digital Sky)Explanation: Why is Venus surrounded by a bright ring?Sometimes called a ring of fire, this rare ring is caused by the Sun's light being visible all around an object.Usually seen around the Moon during an annular solar eclipse, the ring of fire is also visible when either Venus or Mercury cross the face of our Sun. In the featured pictured taken last week, though, Venus did not pass directly in front of the Sun -- the complete atmospheric ring was caused by sunlight scattering around the planet.Venus passed within one degree of the Sun during its inferior conjunction, as it moved from the evening to the morning sky. The extreme brightness of the nearby Sun made capturing such an image very difficult -- the featured image was only made possible by using a temporary filter to block direct sunlight.The image was captured from Thorton, Leicestershire, UK.The pervasive blue sky glow indicates that the image was actually captured during the day.
2020年06月08日
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