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2023-10-04
2023年10月04日:IC 2118:女巫头星云-(IC 2118: The Witch Head Nebula)
2023年10月04日:IC 2118:女巫头星云-(IC 2118: The Witch Head Nebula)--原图下载{mtitle title="IC 2118:女巫头星云"/}Image Credit & Copyright: Abdullah Alharbi说明: 这个星云看起来像女巫的头吗?这个星云之所以有"女巫头星云"的称号,则是因为它的外观形似万圣节风格漫画的女巫之头部。不过,它究竟是如何形成的,至真仍是一个富有想像力的题材。很可确定的是,IC 2118约有50光年宽,由气体和尘埃所组成,并且面向附近的参宿七,因为它已被这颗恒星侵蚀掉了一部分。参宿七是猎户座的亮星之一,位于这张主题影像的底缘下方。女巫头星云的泛蓝色泽,除了因为参宿七强烈的泛蓝星光之外,也因为它的尘埃微粒散射蓝光的效率高于红光。同样的物理过程也造就了地球白昼的蓝天,只不过地球大气里的散射体是氮和氧分子。{lamp/}原文:{mtitle title="IC 2118: The Witch Head Nebula"/}Image Credit & Copyright: Abdullah AlharbiExplanation: Does this nebula look like the head of a witch?The nebula is known popularly as the Witch Head Nebula because, it is said, the nebula's shape resembles a Halloween-style caricature of a witch's head.Exactly how, though, can be a topic of imaginative speculation. What is clear is that IC 2118 is about 50 light-years across and made of gas and dust that points to -- because it has been partly eroded by -- the nearby star Rigel.One of the brighter stars in the constellation Orion, Rigel lies below the bottom of the featured image.The blue color of the Witch Head Nebula and is caused not only by Rigel's intense blue starlight but because the dust grains scatter blue light more efficiently than red. The same physical process causes Earth's daytime sky to appear blue, although the scatterers in planet Earth's atmosphere are molecules of nitrogen and oxygen.
2023年10月04日
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2022-01-24
2022年01月24日:参宿七与女巫头星云-(Rigel and the Witch Head Nebula)
2022年01月24日:参宿七与女巫头星云-(Rigel and the Witch Head Nebula)--原图下载{mtitle title="参宿七与女巫头星云"/}Image Credit & Copyright: José Mtanous说明: 在星光的照耀下,这付怪异的脸谱在黝黑的太空中荧荧生辉,而它扭曲如钩的轮廓,为它博得女巫头星云的暱称。在这幅令人着迷的望远镜影像里,女巫看似盯着猎户座明亮的超巨星参宿七。正式编录号为IC 2118、跨幅超过50光年的的女巫头星云,是一团正在反射参宿七星光的星际尘埃云。而女巫头星云和参宿七周围尘埃的泛蓝色泽,除了是受到参宿七强烈泛蓝星光的直接照耀之外,有部分来自尘埃微粒散射蓝光的效率高于散射红光。相同的物理过程,也造就了地球白画的蓝天,只不过在地球上,造成散射的粒子是地球大气里的氮和氧分子。参宿七、女巫头星云和它们周围的云气和尘埃,距离我们约800光年远。{lamp/}原文:{mtitle title="Rigel and the Witch Head Nebula"/}Image Credit & Copyright: José MtanousExplanation: By starlight this eerie visage shines in the dark,a crooked profile evoking its popular name, theWitch Head Nebula.In fact, this entrancingtelescopic portrait gives the impression thatthe witch has fixed her gaze on Orion's bright supergiantstar Rigel.More formally known asIC 2118,the Witch Head Nebula spans about 50 light-years andis composed of interstellar dust grains reflecting Rigel's starlight.The blue color of the Witch Head Nebula and of the dust surroundingRigelis caused not only by Rigel's intense blue starlight but because thedust grains scatter blue light more efficiently than red.The samephysical process causesEarth's daytime sky to appear blue, although the scatterers inEarth's atmosphere are molecules of nitrogen and oxygen.Rigel, the Witch Head Nebula, and gas and dust that surrounds them lie about 800 light-years away.
2022年01月24日
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2018-12-31
2018年12月31日:女巫头星云-(The Witch Head Nebula)
2018年12月31日:女巫头星云-(The Witch Head Nebula)--原图下载{mtitle title="女巫头星云"/}Image Credit & Copyright: Digitized Sky Survey (POSS II); Processing: Utkarsh Mishra说明: 劳累叠着劳累,麻烦叠着麻烦…;烈火猛燃,大锅沸腾(沙翁名剧〈马克白〉之一幕)──或许,马克白应该转而就教于女巫头星云。这个外形颇让人惊吓的反射星云,离我们约有800光年远;它恶毒的脸孔,似乎在瞪视邻近、位在影像右端之外的猎户座亮星参宿七。这团编录号为IC 2118的星际尘埃与气体云,大小将近有70光年,其尘埃微粒不停的反射参宿七的星光。在这幅组合影像里,星云的色泽除了是受到参宿七强烈泛蓝星光的渲染之外,也因其尘埃微粒散射蓝光的效率高于红光。相同的物理过机制,也造就了地球白画的蓝天,只不过在地球大气中,散射光的粒子是氮和氧分子。{lamp/}原文:{mtitle title="The Witch Head Nebula"/}Image Credit & Copyright: Digitized Sky Survey (POSS II); Processing: Utkarsh MishraExplanation: Double,double toil and trouble;Fire burn, and cauldron bubble .... maybe Macbethshould have consulted the Witch Head Nebula.A frighteningly shapedreflection nebula, thiscosmic crone is about 800 light-years away though.Its malevolent visage seems to glare toward nearby bright star Rigel in Orion,just off the left edge of this frame.More formally known asIC 2118,the interstellar cloud of dust and gas is nearly 70 light-years across,its dust grains reflecting Rigel's starlight.In this composite portrait, the nebula's coloris caused not only by the star's intense bluish light but because thedust grainsscatter blue light more efficiently than red.The same physical process causesEarth's daytime sky to appear blue,although the scatterers inplanet Earth's atmosphere are molecules of nitrogen and oxygen.
2018年12月31日
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2015-10-30
2015年10月30日:女巫头星云-(The Witch Head Nebula)
2015年10月30日:女巫头星云-(The Witch Head Nebula)--原图下载{mtitle title="女巫头星云"/}Image Credit &Copyright: JeffSignorelli说明: 劳累叠着劳累,麻烦叠着麻烦…;烈火猛燃,大锅沸腾(沙翁名剧〈马克白〉之一幕)──或许,马克白应该转而就教于女巫头星云。这个外观易于引发联想的反射星云,离我们约有800光年远;它吓人的脸孔,似乎在瞪视邻近、位在影像右端之外的猎户座亮星参宿七。这团正式的名称为IC 2118的星际尘埃与气体云,大小将近有70光年,其尘埃微粒不停地反射参宿七的星光。在这幅组合影像里,星云的色泽除了是受到参宿七强烈蓝色星光的渲染之外,也因其尘埃微粒散射蓝光的效率高于红光。相同的物理过程也造就了地球白画的蓝天,只不过在地球大气中,散射光的粒子是氮和氧分子。{lamp/}原文:{mtitle title="The Witch Head Nebula"/}Image Credit &Copyright: JeffSignorelliExplanation: Double,double toil and trouble;Fire burn, and cauldron bubble .... maybe Macbethshould have consulted the Witch Head Nebula.A frighteningly shapedreflection nebula, thiscosmic crone is about 800 light-years away though.Its malevolent visage seems to glare toward nearby bright star Rigel in Orion,just off the right edge of this frame.More formally known asIC 2118,the interstellar cloud of dust and gas is nearly 70 light-years across,its dust grains reflecting Rigel's starlight.In thiscomposite portrait, the nebula's coloris caused not only by the star's intense bluish light but because thedust grainsscatter blue light more efficiently than red.The same physical process causesEarth's daytime sky to appear blue,although the scatterers inplanet Earth's atmosphere are molecules of nitrogen and oxygen.
2015年10月30日
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2012-11-01
2012年11月01日:参宿七与女巫头星云-(Rigel and the Witch Head Nebula)
2012年11月01日:参宿七与女巫头星云-(Rigel and the Witch Head Nebula)--原图下载{mtitle title="参宿七与女巫头星云"/}Image Credit &Copyright: Rogelio Bernal Andreo(Deep Sky Colors)说明: 劳累叠着劳累,麻烦叠着麻烦…;烈火猛燃,大锅沸腾(沙翁名剧〈马克白 (Macbeth)〉之一幕)──或许马克白应该转而就教于女巫头星云(the Witch Head Nebula)。这个外观容易引发联想的反射星云,较正式的名称为IC 2118,大小约有50光年,位在猎户座亮星参宿七 (Rigel)附近,因内部的星际尘埃微粒反射参宿七的星光而现蹤。在这幅影像中,女巫头星云和参宿七周围尘埃所呈现的蓝色色泽,除了因为参宿七发出强烈的蓝色星光之外,部份来自它们散射蓝光的效率高于红光。类似的物理过程也造成了地球白画的蓝天,只不过在地球大气中,散射光的粒子换成了氮和氧分子。参宿七、女巫头星云和它们周遭的尘埃,离我们约有800光年远。{lamp/}原文:{mtitle title="Rigel and the Witch Head Nebula"/}Image Credit &Copyright: Rogelio Bernal Andreo(Deep Sky Colors)Explanation: Double,double toil and trouble;Fire burn, and cauldron bubble -- maybeMacbeth should have consulted the Witch Head Nebula.The suggestively shapedreflection nebulais associated with thebrightstar Rigel in the constellation Orion.More formally known asIC 2118,the Witch Head Nebula spans about 50 light-years andis composed of interstellar dust grainsreflecting Rigel'sstarlight.In this cosmic portrait,the blue color of the Witch Head Nebula and of the dust surroundingRigelis caused not only byRigel's intenseblue starlight but because thedust grains scatter blue light more efficiently than red.The samephysical process causesEarth's daytime sky to appear blue, although the scatterers inEarth's atmosphere are molecules ofnitrogen and oxygen.Rigel, the Witch Head Nebula, and gas and dust that surrounds them lie about 800 light-years away.
2012年11月01日
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2009-12-29
2009年12月29日:参宿七与女巫头星云-(Rigel and the Witch Head Nebula)
2009年12月29日:参宿七与女巫头星云-(Rigel and the Witch Head Nebula)--原图下载{mtitle title="参宿七与女巫头星云"/}Credit & Copyright: Rogelio Bernal Andreo(Deep Sky Colors)说明: 努力吧!忙碌吧!猛烈的柴火烧煮着沸腾的大锅(莎翁名剧-马克白)。也许,马克白(Macbeth)该去祈求女巫头星云呢。女巫头星云是一个依照他的形状而命名的反射星云,于影像左下方,受到右方亮星参宿七(Rigel)的影响,位在猎户星座之中。女巫头星云的正式名称为IC 2118,星云会发光是因为星云内微系的尘埃,反射参宿七的星光所形成的。上图中,女巫头星云的蓝色辉光以及参宿七附近尘埃所发出的蓝光,并不只是因为参宿七是蓝色的,也是因为星际尘埃的颗粒,对蓝光的散射效率比红光要好。这与地球白天的天空为蓝色的道理的相同的,只是散射源不同。地球的蓝光是由阳光经由空气中的氮分子与氧分子散射所造成的。参宿七、女巫头星云以及这些星际尘埃与地球相距约800光年。{lamp/}原文:{mtitle title="Rigel and the Witch Head Nebula"/}Credit & Copyright: Rogelio Bernal Andreo(Deep Sky Colors)Explanation: Double, double toil and trouble;Fire burn, and cauldron bubble -- maybeMacbeth should have consulted the Witch Head Nebula.This suggestively shapedreflection nebulaon the lower left is associated with thebright star Rigel, to its right, in theconstellation Orion.More formally known asIC 2118,the Witch Head Nebula glows primarily by light reflected from Rigel.Fine dustin the nebula reflects the light.Pictured above, the blue color of theWitch Head Nebula and of the dust surroundingRigelis caused not only byRigel's blue color but because thedust grains reflect blue light more efficiently than red.The samephysical process causesEarth's daytime sky to appear blue, although the scatterers inEarth's atmosphere are molecules ofnitrogen andoxygen.Rigel, the Witch Head Nebula, and gas and dust that surrounds them lie about 800 light-years away.
2009年12月29日
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