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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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2023-05-27
2023年05月27日:蛾眉相的海王星和海卫一-(Crescent Neptune and Triton)
2023年05月27日:蛾眉相的海王星和海卫一-(Crescent Neptune and Triton)--原图下载{mtitle title="蛾眉相的海王星和海卫一"/}Image Credit: NASA,Voyager 2说明: 当年在太阳系的外围曳航时,航行者2号太空船回首望向太阳,见到了这付海王星和海卫一同时带着蛾眉相的景观。拍摄这幅冰巨行星及最大卫星合影的优雅照片时,航行者号刚通过最接近海王星的位置,然后旋绕到它们的后方。这是从地球拍不到的海王星影像,因为较近太阳的地球,所见的海王星永远满相。 此外,在往日球层顶及其后方飞掠的这艘太空船所在的道别视角里,海王星熟悉的泛蓝色泽也不再得见。{lamp/}原文:{mtitle title="Crescent Neptune and Triton"/}Image Credit: NASA,Voyager 2Explanation: Gliding through the outerSolar System,in 1989 theVoyager 2 spacecraftlooked toward the Sun to find this view of most distant planet Neptuneand its moonTriton together in a crescent phase. The elegant image of ice-giant planetand largest moonwas taken from behind just after Voyager'sclosest approach.It could not have been taken fromEarth because the most distant planet never shows a crescent phaseto sunward eyes.Heading for theheliopause and beyond,the spacecraft'sparting vantagepoint also robs Neptune of its familiar blue hue.
2023年05月27日
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2022-01-10
2022年01月10日:李奥纳德彗星摇摆的彗尾-(Comet Leonard's Tail Wag)
2022年01月10日:李奥纳德彗星摇摆的彗尾-(Comet Leonard's Tail Wag)--原图下载2022 January 10 {mtitle title="李奥纳德彗星摇摆的彗尾"/}Image Credit: NASA, NRL, STEREO-A; Processing: B. Gallagher说明: 为何李奥纳德彗星的彗尾会摇摆不定?这部缩时主题影片,呈现彗星C/2021 A1(李奥纳德)在上个月初10天之间的变化。这部影片是由美国航太总署的日地关係天文台─前导卫星(STEREO-A)所拍摄;此卫星和地球共轨绕太阳公转,故其与太阳的距离和地球相近。为提高反差,影片每一幅宽29度的定格,都是前后二张照片相减所得。这部影片清楚显示,李奥纳德彗星的颀长离子尾,是受到从太阳泛流出的高速离子(太阳风)之吹袭,才会持续伸长与摇摆。在拍摄这部影片之后,李奥纳德彗星继续往它于水星和金星轨道之间的近日点飞奔,在与太阳最近距接近后并未崩解,目前已踏上远离太阳系的旅程并逐渐暗去。{lamp/}原文:{mtitle title="Comet Leonard's Tail Wag"/}Image Credit: NASA, NRL, STEREO-A; Processing: B. GallagherExplanation: Why does Comet Leonard's tail wag?The featured time-lapse video shows the ion tail of Comet C/2021 A1 (Leonard) as it changed over ten days early last month. The video was taken by NASA's Solar Terrestrial Relations Observatory-Ahead (STEREO-A) spacecraft that co-orbits the Sun at roughly the same distance as the Earth.Each image in this 29-degree field was subtracted from following image to create frames that highlight differences.The video clearly shows Comet Leonard's long ion tail extending, wagging, and otherwise being blown around by the solar wind -- a stream of fast-moving ions that stream out from the Sun. Since the video was taken, Comet Leonard continued plunging toward the Sun, reached its closest approach to the Sun between the orbits of Mercury and Venus, survived this closest approach without breaking apart, and is now fading as heads out of our Solar System.
2022年01月10日
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2021-07-25
2021年07月25日:蛾眉相的海王星和海卫一-(Crescent Neptune and Triton)
2021年07月25日:蛾眉相的海王星和海卫一-(Crescent Neptune and Triton)--原图下载{mtitle title="蛾眉相的海王星和海卫一"/}Image Credit: NASA,Voyager 2说明: 当年静静的在太阳系外围曳航时,航行者2号太空船的相机,拍下了这幅蛾眉相海王星和海卫一的影像。这是从地球拍不到的海王星影像,因为较近太阳的地球,所见的海王星永远满相。1989年拍摄这幅影像时,航行者刚通过最靠近 海王星的位置,并旋绕到这颗气态巨行星和它云雾弥漫卫星的后方。在航行者这个不寻常的视角,海王星熟悉的泛蓝色泽不见了,因为阳光透过海王星的大气时,蓝光大多被散射掉,让它看起来较像是红化的落日。拥有数道黝黑行星环的海王星,体积比天王星小,不过质量反而较大 ,而且辐射的热能也比得自太阳的要多。{lamp/}原文:{mtitle title="Crescent Neptune and Triton"/}Image Credit: NASA,Voyager 2Explanation: Gliding silently through the outerSolar System, theVoyager 2 spacecraft camera capturedNeptune andTriton together in crescent phase. The elegant picture of theice-giant planet and itscloudy moon was taken from behind just afterclosest approach in 1989. It could not have been taken fromEarth becauseNeptune never shows a crescent phase to sunward Earth.Theunusual vantage point also robsNeptune of its familiar blue hue,as sunlight seen from here is scattered forward,and so is reddened like thesetting Sun. Neptune is smaller but more massive thanUranus, has severaldark rings, and emits more light than it receives from the Sun.
2021年07月25日
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2018-12-20
2018年12月20日:红星云、绿彗星与蓝恆星-(Red Nebula, Green Comet, Blue Stars)
2018年12月20日:红星云、绿彗星与蓝恆星-(Red Nebula, Green Comet, Blue Stars)--原图下载{mtitle title="红星云、绿彗星与蓝恆星"/}Image Credit &Copyright: Tom Masterson (Grand Mesa Observatory)说明: 这片嘉年华会般的彩色星空,摄于12月17日的清晨,在维尔塔宁彗星最近距离通过地球附近之后。这颗肉眼勉强可见的彗星,美丽彗发的泛绿色泽,只有在叠加了数张以位在昴宿星团下方的彗星为导星的照片之后,才得以显现出来。这些照片也突显了年轻昴宿星团成员星的蓝色星光,从恒星周围的尘埃云反射之景象。沿着英仙分子云边缘的暗色尘埃云向左扫视,视线会来到名为加州星云的发射星云NGC 1499。这团过于昏暗而肉眼不得见的星云,其鲜明的泛红辉光来自与电子复合的电离氢原子。在12月23日左右,维尔塔宁彗星会运行到御夫座的亮星五车二附近,届时用双筒望远镜就能轻易找到它。{lamp/}原文:{mtitle title="Red Nebula, Green Comet, Blue Stars"/}Image Credit &Copyright: Tom Masterson (Grand Mesa Observatory)Explanation: Thisfestively colored skyscape was captured in the early morninghours of December 17, followingComet Wirtanen'sclosest approach toplanet Earth.The comet was just visible to the eye.The lovely green color of its fluorescing cometary atmosphereor coma is brought out here only by adding digital exposuresregistered on the comet's position below the Pleiades star cluster.The exposures also bring out blue starlight reflected by thedust clouds surrounding the young Pleiades stars.Gaze (toward the left) across dusty dark nebulae alongthe edge of the Perseus molecular cloud and you'lltravel to emission nebulaNGC 1499, also known as the California nebula.Too faintfor the eye, the cosmic cloud's pronounced reddish glowis from electrons recombining with ionized hydrogen atoms.Around December 23rd, Comet Wirtanen should be easy tofind with binocularswhen it sweeps close to bright star Capellain the northern winter constellation Auriga, the Charioteer.
2018年12月20日
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2017-12-22
2017年12月22日: 双子座流星-(Gemini's Meteors)
2017年12月22日: 双子座流星-(Gemini's Meteors)--原图下载{mtitle title=" 双子座流星"/}Composite Image Credit &Copyright: Jeff Dai(TWAN)说明: 在这幅美丽的组合夜晚影像里,中国东北黑龙江省幽暗天空中的流星,洒向寒冬笼罩下的大地。影像所记录的48颗流星,是上星期年度双子座流星雨的一部分。纵然当时的气温是零下28度,但这些流星全都是使用相机,记录于这个天文年度盛事的极大期之时。这些流星从这群流星雨高悬在地平线上空,那二颗双子座亮星附近的辐射点喷涌而出。通常很活跃的双子座流星雨,今年在12月13-14日的极大期,恰好在小行星3200法厄同 (3200 Phaethon)于12月16日运行到最靠近地球之前。而神祕的3200法厄同,则可能是双子座流星的母天体。{lamp/}原文:{mtitle title="Gemini's Meteors"/}Composite Image Credit &Copyright: Jeff Dai(TWAN)Explanation: From dark skiesabove Heilongjiang province in northeastern China,meteors rain down on a wintry landscape in this beautifulcomposited night scene.The 48 meteors are part of last week's annual Geminid meteor shower.Despitetemperatures of -28 degrees C, all were recorded in cameraexposures made during the peak hour of the celestial spectacle.They stream away from the shower's radiant high above thehorizon near the two bright stars of the zodiacalconstellation of the Twins.A very active shower,this year the December 13-14 peak of the Geminidsarrived just before the December 16closest approach ofasteroid 3200 Phaethon to planet Earth.Mysterious3200Phaethon is the Geminid shower's likely parent body.
2017年12月22日
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2003-06-28
2003年06月28日:梅西叶天体和火星-(Messiers and Mars)
2003年06月28日:梅西叶天体和火星-(Messiers and Mars)--原图下载{mtitle title="梅西叶天体和火星"/}Credit & Copyright: MichaelCole说明: 用望远镜观看银河系核心附近的星野,就可以看见人马座 (Sagittarius)内许多的亮星团和这部份宇宙空间的亮星云。上面这张美丽的彩色深空影像,呈现了十八世纪梅西叶 (Charles Messier)所编星表中的M8 和M20等两个夜空珍宝。 影像左上方的M20又称为三裂星云 (Trifid Nebula),在周围黝黑尘埃带的衬托下,它红蓝两色的外观非常的突出。在M20的右下方的是M8,它又名为礁湖星云 (Lagoon Nebula),具有一大片迷人的红色弥漫辉光。这两个星云距离我们都有数千光年,不过,影像右边极端明亮的 火星,离我们就没那么远。 影像中过度曝光的红色行星,离我们只有四光分呢。它现在几乎运行到1988年以来离地球最近的位置。这段期间的火星从东南东方昇起,子夜时它的亮度可达-1.4星等。上面这张影像是五月20日的淩晨三点由天文摄影家Michael Cole所拍摄的,拍摄的地点是美国奥勒冈州的汉考克营 (Camp Hancock, Oregon)。{lamp/}原文:{mtitle title="Messiers and Mars"/}Credit & Copyright: MichaelColeExplanation: A telescopic tour of theconstellationSagittarius offers the manybright clusters and nebulae ofdimensioned space in astarscapesurrounding thegalactic center.This gorgeouscolordeep-sky photograph visits two such lovely sights,cataloged by the 18th century cosmic touristCharlesMessier as M8 and M20.M20 (upper left),the Trifid Nebula, presents a striking contrast inred/blue colors and dark dust lanes.Just below and to the right is theexpansive, alluring red glow of M8,the Lagoon Nebula.Both nebulae are a few thousand light-years distantbut at the far right, the dominant celestial beacon is a "local"source, theplanet Mars.Just passing through Sagittarius andstrongly overexposed in this picture,the Red Planetwas a short 4 light-minutes away.Now headedfor itsclosest approach to planetEarth in recorded history, Mars rises in the east southeastby midnight shining brightly at about -1.4magnitude.Urban imagerMichael Cole recorded this photograph at 3:00 AM on May 20th, 2001in clear skies over Camp Hancock, Oregon, USA.
2003年06月28日
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