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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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2023-01-25
2023年01月25日:LDN 1622:恶灵星云-(LDN 1622: The Boogeyman Nebula)
2023年01月25日:LDN 1622:恶灵星云-(LDN 1622: The Boogeyman Nebula)--原图下载{mtitle title="LDN 1622:恶灵星云"/}Image Credit & Copyright: Joshua Carter说明: 有些人或许会认为这团黝黑的天体,形似传说中的恶灵。但在科学上来说,以散发淡淡辉光的氢气为衬托的林茨暗星云1622(LDN 1622),只有在此区的长曝光望远镜影像里才得以现蹤。相较之下,位在这幅主题影像中右上方的反射星云vdB 62,较明亮也较容易分辨。LDN 1622位我们银河系的盘面附近,在天空中的位置,离环拱猎户腰带、配剑及其上的大片发射星云複合体的巴纳德 环不远。带着后掠轮廓的LDN 1622之黝黑尘埃,距离咸认与猎户座着名的星云相近,离我们或许只有1,500光年远。以这个距离来换算,这片2度宽的视野,对应的宽度大约为60光年。此外,史匹哲太空望远镜的红外光影像,发现这大片暗星云内藏着刚诞生的年轻恒星。(Boogeyman Nebula 恶灵星云){lamp/}原文:{mtitle title="LDN 1622: The Boogeyman Nebula"/}Image Credit & Copyright: Joshua CarterExplanation: To some, the dark shape looks like a mythical boogeyman. Scientifically, Lynds' Dark Nebula(LDN) 1622 appears against a faintbackground of glowing hydrogen gas only visible in long telescopicexposures of the region.In contrast, the brighter reflection nebulavdB 62 is more easilyseen just above and to the right of center in the featured image.LDN 1622 lies near the plane of our Milky Way Galaxy,close on the sky toBarnard'sLoop,a large cloud surrounding the richcomplex of emission nebulae foundin the Belt and Swordof Orion.With swept-back outlines, the obscuring dust of LDN 1622 is thoughtto lie at a similar distance, perhaps 1,500 light-years away.At that distance, this 2-degree wide field of viewwould span about 60 light-years.Youngstars do lie hidden within the dark expanse and have been revealed in Spitzer Space Telescopeinfrared images.
2023年01月25日
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2023-01-17
2023年01月17日:仙女大星系方向的未预期云气-(Unexpected Clouds Toward the Andromeda Galaxy)
2023年01月17日:仙女大星系方向的未预期云气-(Unexpected Clouds Toward the Andromeda Galaxy)--原图下载{mtitle title="仙女大星系方向的未预期云气"/}Image Credit & Copyright: Yann Sainty & Marcel Drechsler说明: 为何仙女大星系方向附近会出现氧辐射弧?没人能说个准。这道以蓝色显示的气体弧,是刚在去年由业余天文学家 所发现并获得确认。为何仙女大星系方向附近会有这种气弧,目前有2个主要的起源假说:它们真的位在仙女大星系(M31)附近,或者它们是我们银河系里的云气丝,只是凑巧出现在此方向。更令人费解的是,以前主要在氢及其他辐射波段拍摄的M31深空影像,并没见到这种气体弧,而其他更遥远星系的影像,通常也没出现类似的氧辐射结构。之所以是由使用商用望远镜的业余天文热爱者,做出此项发现的部分原因是:专业望远镜通常只探索夜空很小张角的区域,而这些辐射弧的跨度高达数个满月。想当然耳,未来必然会在氧及其他元素的辐射波段进行后续观测。{lamp/}原文:{mtitle title="Unexpected Clouds Toward the Andromeda Galaxy"/}Image Credit & Copyright: Yann Sainty & Marcel DrechslerExplanation: Why are there oxygen-emitting arcs near the direction of the Andromeda galaxy?No one is sure.The gas arcs, shown in blue, were discovered and first confirmed by amateur astronomers just last year.The two main origin hypotheses for the arcs are that they really are close to Andromeda (M31), or that they are just coincidentally placed gas filaments in our Milky Way galaxy. Adding to the mystery is that arcs were not seen in previous deep images of M31 taken primarily in light emitted by hydrogen, and that other, more distant galaxies have not been generally noted as showing similar oxygen-emitting structures. Dedicated amateurs using commercial telescopes made this discovery because, in part, professional telescopes usually investigate angularly small patches of the night sky, whereas these arcs span several times the angular size of the full moon. Future observations -- both in light emitted by oxygen and by other elements -- are sure to follow.
2023年01月17日
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2023-01-01
2023年01月01日:太阳系最大的石块-(The Largest Rock in our Solar System)
2023年01月01日:太阳系最大的石块-(The Largest Rock in our Solar System)--原图下载{mtitle title="太阳系最大的石块"/}Image Credit: NASA, Voyager 1 spacecraft说明: 影像右侧的亮点,就是太阳系现知最大的石块。它大于所有已知的小行星、卫星和彗星 核;也大于太阳系其他的石质行星。这颗岩石是如此之大,以至于本身的重力让它聚成球形,并把较重的气体束缚在表面附近。(它曾是已知各种形态的石块中最大者,然而在不久前发现绕行其他恒星的大型緻密系外行星之后,它就此跌落王座。)这幅主题影像,是由1990年飞到太阳系外围的航行者1号太空船所拍摄,并以现在众所皆知的“淡蓝小点”来称呼这颗太空巨石。如今这颗石头,即将再次展开它绕行母星的旅程;在过去,它大约已经绕行了50亿次,而每次也自转超过350圈。于此祝这颗我们称为地球的巨石上之所有住民,格里曆新年快乐。{lamp/}原文:{mtitle title="The Largest Rock in our Solar System"/}Image Credit: NASA, Voyager 1 spacecraftExplanation: There, that dot on the right, that's the largest rock known in our Solar System.It is larger than every known asteroid, moon, and comet nucleus. It is larger than any other local rocky planet. This rock is so large its gravity makes it into a large ball that holds heavy gases near its surface. (It used to be the largest known rock of any type until the recent discoveries of large dense planets orbiting other stars.) The Voyager 1 spacecraft took the featured picture -- famously called Pale Blue Dot --of this giant space rock in 1990 from the outer Solar System. Today, this rock starts another orbit around its parent star, for roughly the 5 billionth time, spinning over 350 times during each trip. Happy Gregorian Calendar New Year to all inhabitants of this rock we call Earth.
2023年01月01日
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2021-07-04
2021年07月04日:火星脸谱-(The Face on Mars)
2021年07月04日:火星脸谱-(The Face on Mars)--原图下载{mtitle title="火星脸谱"/}Image Credit: NASA, Viking 1 Orbiter说明: 如果天空的云朵是城堡,该多好玩? 如果卧室椅子上的髒衣服是超级英雄,不知该多有趣呢? 如果火星上的石头 台地,真的是行星际的人脸记念建筑,会不会让我们乐翻天?不过实际上,云是漂浮在天上的小水滴。衣物是棉花、羊毛或塑胶纤维所织就的。 而着名的火星石头台地,虽然有“火星脸谱”的称号,不过在较清晰的影像里,看起来只是自然的景观。现实很无趣,是不?没人知道为何有些云会下雨,没人知道火星是否曾有生命,也没人知道为何卧室里的髒衣服闻起像沙士。科学探索不但可以解开谜团,也会发掘出新知识、更大的谜团、及更深入的问题。随着人类持续探索宇宙,或许与发现俱来的乐趣才刚开头呢。{lamp/}原文:{mtitle title="The Face on Mars"/}Image Credit: NASA, Viking 1 OrbiterExplanation: Wouldn't it be fun if clouds were castles? Wouldn't it be fun if the laundry on the bedroom chair was a superhero? Wouldn't it be fun if rock mesas on Mars were interplanetary monuments to the human face? Clouds, though, are floating droplets of water and ice. Laundry is cotton, wool, or plastic, woven into garments. Famous Martian rock mesas known by names like the Face on Mars appear quite natural when seen more clearly on better images. Is reality boring?Nobody knows why some clouds make rain. Nobody knows if life ever developed on Mars. Nobody knows why the laundry on the bedroom chair smells like root beer. Scientific exploration can not only resolve mysteries, but uncover new knowledge, greater mysteries, and yet deeper questions. As humanity explores our universe, perhaps fun -- through discovery -- is just beginning.
2021年07月04日
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2021-04-09
2021年04月09日:星系M106-(Messier 106)
2021年04月09日:星系M106-(Messier 106)--原图下载{mtitle title="星系M106"/}Image Credit: NASA, Hubble Legacy Archive,Kitt Peak NationalObservatory;Amateur Data & ProcessingCopyright:Robert Gendler说明: 邻近大熊座,被猎犬座群星环绕的这个星系,是由公制推手、法国天文学家梅尚 发现于1781年。后来,他的朋友兼同事梅西叶把它纳入他编录的星表里,成为M106。近代的深空影像证实它是个宇宙岛,一个位在银河系众星后方,宽约3万光年,离我们只有2千1百万光年远的螺旋星系。除了鲜明的尘埃带和明亮的星系核之外,这幅整合业余及专业望远镜数据的精采组合影像,也突显了螺旋臂上的年轻泛蓝星团和泛红的恒星诞生区,以及由辉光氢气构成的精彩泛红喷流。 此外,在这幅影像里,可见到右下角的小伴星系NGC 4248,以及散布在影像各处的背景星系。M106 (亦称NGC 4258)是一个邻近的西佛型活跃星系,在电波至X射线的所有电磁波段都很明亮。活跃星的能源,据信是来自掉进大质量星系核心黑洞的物质。{lamp/}原文:{mtitle title="Messier 106"/}Image Credit: NASA, Hubble Legacy Archive,Kitt Peak NationalObservatory;Amateur Data & ProcessingCopyright:Robert GendlerExplanation: Close to the Great Bear(Ursa Major) and surrounded by the stars of theHunting Dogs(Canes Venatici), this celestial wonder wasdiscoveredin 1781 by themetricFrench astronomerPierre Mechain.Later, it was added to the catalog of his friend and colleagueCharles Messier asM106.Modern deep telescopic views reveal it to be anisland universe -a spiral galaxy around 30 thousand light-years across locatedonly about 21 million light-years beyond the stars of the Milky Way.Along with a bright central core, thisstunning galaxy portrait,a composite of image data from amateur and professional telescopes,highlights youthful blue star clusters and reddish stellar nurseriestracing the galaxy's spiral arms.It also shows off remarkable reddishjets ofglowing hydrogen gas.In addition to small companion galaxy NGC 4248 at bottom right,background galaxies can be found scattered throughout the frame.M106, also known as NGC 4258, is a nearby example of theSeyfert class of active galaxies, seenacross the spectrumfrom radio to X-rays.Active galaxies are powered by matter falling into a massivecentral black hole.
2021年04月09日
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2021-01-04
2021年01月04日:每秒100,000定格影片里的红色精灵-(Sprite Lightning at 100,000 Frames Per Second)
2021年01月04日:每秒100,000定格影片里的红色精灵-(Sprite Lightning at 100,000 Frames Per Second)--原图下载2021 January 4 {mtitle title="每秒100,000定格影片里的红色精灵"/}Video Credit & Copyright: Matthew G McHarg, Jacob L Harley, Thomas Ashcraft, Hans Nielsen说明: 红色精灵是怎么产生的?纵然发现它们已有30多年了,但是天空中这些酷似庞大水母的神祕短暂发光事件,除了知道它们通常和云对地正闪电有关联之外,其根本的成因目前仍然不明。有些雷暴系统会产生它们,但大部分雷暴系统不会。近些年来,高速影片渐渐能解析出红色精灵发展的细节。这部摄于2019年中、速度约为每秒100,000定格的主题影片,快到在时间上可以解析出数颗红色精灵“弹”如何下坠,然后再发展成静态影像里常见的分岔流光束。很遗憾的,像 这类 影片提供的视觉线索,仍然无法完全解开红色精灵的成因谜团。不过对有些研究者而言,高速影片隐指当高层大气里有电浆不规则体时,较容易发生红色精灵。{lamp/}原文:{mtitle title="Sprite Lightning at 100,000 Frames Per Second"/}Video Credit & Copyright: Matthew G McHarg, Jacob L Harley, Thomas Ashcraft, Hans NielsenExplanation: What causes sprite lightning?Mysterious bursts of light in the sky that momentarily resemble gigantic jellyfish have been recorded for over 30 years, but apart from a general association with positive cloud-to-ground lightning, their root cause remains unknown.Some thunderstorms have them -- most don't. Recently, however, high speed videos are better detailing how sprites actually develop. The featured video,captured in mid-2019, is fast enough -- at about 100,000 frames per second -- to time-resolve several sprite "bombs" dropping and developing into the multi-pronged streamers that appear on still images.Unfortunately, the visual clues provided by videos like these do not fully resolve the sprite origins mystery.High speed vidoes do indicate to some researchers, though, that sprites are more likely to occur when plasma irregularities exist in the upper atmosphere.
2021年01月04日
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