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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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2023-11-27
2023年11月27日:LBN 86:鹰魟星云-(LBN 86: The Eagle Ray Nebula)
2023年11月27日:LBN 86:鹰魟星云-(LBN 86: The Eagle Ray Nebula)--原图下载{mtitle title="LBN 86:鹰魟星云"/}Image Credit & Copyright: Vikas Chander说明: 这只鹰魟在宇宙海里滑翔。这个由气体和尘埃组成、编录号为SH2-63和LBN 86的暗星云,恰巧形似常见的海鱼。这团星际尘埃星云之所以是浅棕色的,则是因为它遮挡并红化了来自后方的可见光。暗星云的主要发光波段在红外光,但也会反射周围恒星的可见光。暗星云内的尘埃,通常是次毫米大小的粒状碳、硅和氧,外面则包覆着冻结的一氧化碳和氮。暗星云亦称为分子云,因为它们拥有相对丰富的分子 氢及大分子。这团先前未命名,如今有鹰魟暱称的星云,通常很昏暗,但是在这幅摄于智利 幽暗天空下、曝光时间超过20小时的影像里,其身影变得很清晰。(eagle ray 鹰魟 鹞鲼){lamp/}原文:{mtitle title="LBN 86: The Eagle Ray Nebula"/}Image Credit & Copyright: Vikas ChanderExplanation: This eagle ray glides across a cosmic sea. Officially cataloged as SH2-63 and LBN 86, the dark nebula is composed of gas and dust that just happens to appear shaped like a common ocean fish. The interstellar dust nebula appears light brown as it blocks and reddens visible light emitted behind it.Dark nebulas glow primarily in infrared light, but also reflect visible light from surrounding stars.The dust in dark nebulas is usually sub-millimeter chunks of carbon, silicon, and oxygen, frequently coated with frozen carbon monoxide and nitrogen. Dark nebulas are also known as molecular clouds because they also contain relatively high amounts of molecular hydrogen and larger molecules.Previously unnamed, the here dubbed Eagle Ray Nebula is normally quite dim but has been imaged clearly over 20-hours through dark skies in Chile.
2023年11月27日
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2023-10-17
2023年10月17日:恆星PDS 70的吸积盘、行星及卫星-(PDS 70: Disk, Planets, and Moons)
2023年10月17日:恆星PDS 70的吸积盘、行星及卫星-(PDS 70: Disk, Planets, and Moons)--原图下载{mtitle title="恆星PDS 70的吸积盘、行星及卫星"/}Image Credit: ALMA (ESO/NAOJ/NRAO); M. Benisty et al.说明: 最受重视的并非这幅影像里的大吸积环。纵然环拱恒星PDS 70、会形成行星的大吸积环,在影像里非常清晰,而且本身也非常有趣。 也不是影像右侧、紧贴在大吸积盘内侧的行星,吸引了最多的讨论声量。虽然这颗编号为PDS 70c的行星,大小和质量都和木星很相近,而且刚形成不久。真正引起骚动的,是行星PDS 70c周围的弥漫斑块。那团弥漫的斑块,咸认是前所未见、正在凝聚成卫星的尘埃碟。这幅主题影像,是由位在北智利.阿塔卡玛高原沙漠,拥有66座电波望远镜天线碟的阿塔卡玛大毫米波阵列(ALMA)摄于2021年。根据ALMA的数据,天文学家推断这个正在形成卫星的系外行星碟,半径和地球轨道相近,而且未来或许会形成3颗左右、大小和月球相当的卫星,因此,(这个行星系统的)大卫星数量会和木星的4颗差不多。{lamp/}原文:{mtitle title="PDS 70: Disk, Planets, and Moons"/}Image Credit: ALMA (ESO/NAOJ/NRAO); M. Benisty et al.Explanation: It's not the big ring that's attracting the most attention.Although the big planet-forming ring around the star PDS 70 is clearly imaged and itself quite interesting.It's also not the planet on the right, just inside the big disk, that’s being talked about the most. Although the planet PDS 70c is a newly formed and, interestingly, similar in size and mass to Jupiter.It's the fuzzy patch around the planet PDS 70c that's causing the commotion.That fuzzy patch is thought to be a dusty disk that is now forming into moons -- and that had never been seen before.The featured image was taken in 2021 by the Atacama Large Millimeter Array (ALMA) of 66 radio telescopes in the high Atacama Desert of northern Chile. Based on ALMA data, astronomers infer that the moon-forming exoplanetary disk has a radius similar to our Earth's orbit, and may one day form three or so Luna-sized moons -- not very different from our Jupiter's four.
2023年10月17日
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2023-07-26
2023年07月26日:IC 4628:斑节虾星云-(IC 4628: The Prawn Nebula)
2023年07月26日:IC 4628:斑节虾星云-(IC 4628: The Prawn Nebula)--原图下载{mtitle title="IC 4628:斑节虾星云"/}Image Credit & Copyright: Daniel Stern说明: 在心宿二之南,于满布星云的天蝎座尾部,座落着发射星云IC 4628。而它附近年龄只有数百万年的年轻大质量恒星,以不可见的紫外辐射照射这团星云,把电子从原子中剥离出来,后来电子再与原子复合,产生了以氢红光为主的星云可见辉光。影像
2023年07月26日
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2023-03-28
2023年03月28日:落日的多重绿闪-(A Multiple Green Flash Sunset)
2023年03月28日:落日的多重绿闪-(A Multiple Green Flash Sunset)--原图下载{mtitle title="落日的多重绿闪"/}Image Credit & Copyright: T. Slovinský & P. Horálek (IoP Opava);CTIO, NOIRLab,NSF,AURA说明: 你看过的绿闪能玩这种把戏吗?日落时分的绿闪是一种罕见的事件,也因此,许多太阳观察者都以曾亲眼目睹为荣。绿闪曾被认为只是一种迷思,然而现在的人们知道,当地球大气兼具棱镜及透镜的功能时,就会发生绿闪。不同高度的大气分层所产生的光折射也不同,因此,可让源自太阳顶部的光线发生分光,形成2个影像,并将之适当放大,让日盘即将消失前的最后一抹银白带着泛绿的色泽。不过,这幅影像所呈现的则是更不寻常的日落。在去年4月的某一天,从位于智利的高海拔托洛洛山美洲天文台,拍摄到太阳往具有多个不同热分层的大气后方沈降,形成太阳的多重蜃像。而在这次及这个位置,数个分层同时产生了绿闪。就在这个多重绿闪事件,为2位大吃一惊的天文摄影者记录之后的数秒钟,太阳就没入云层之下。{lamp/}原文:{mtitle title="A Multiple Green Flash Sunset"/}Image Credit & Copyright: T. Slovinský & P. Horálek (IoP Opava);CTIO, NOIRLab,NSF,AURAExplanation: Yes, but can your green flash do this?A green flash at sunset is a rare event that many Sun watchers pride themselves on having seen. Once thought to be a myth, a green flash is now understood to occur when the Earth's atmosphere acts like both a prism and a lens.Different atmospheric layers create altitude-variable refraction that takes light from the top of the Sun and disperses its colors, creates two images, and magnifies it in just the right way to make a thin sliver appear green just before it disappears.Pictured, though, is an even more unusual sunset.From the high-altitude Cerro Tololo Inter-American Observatory in Chile one day last April, the Sun was captured setting beyond an atmosphere with multiple distinct thermal layers, creating several mock images of the Sun. This time and from this location, many of those layers produced a green flash simultaneously.Just seconds after this multiple-green-flash event was caught by two well-surprised astrophotographers, the Sun set below the clouds.
2023年03月28日
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2023-01-10
2023年01月10日:NGC 2264:锥状星云-(NGC 2264: The Cone Nebula)
2023年01月10日:NGC 2264:锥状星云-(NGC 2264: The Cone Nebula)--原图下载{mtitle title="NGC 2264:锥状星云"/}Image Credit & Copyright: Matthew Dieterich说明: 恒星正形成于名为锥状星云的巨大尘埃柱之内。在恒星育婴室里,诞生恒星的云气和尘埃云受到新恒星高能恒星风之雕塑,常会形成许多锥状物、云气柱和壮观且具有流动感的结构。着名的範例之一,是位在明亮银河恒星形成区NGC 2264之内的锥状星云。上面这幅最近由位在智利.El Sauce天文台的50公分口径望远所拍摄的主题影像,总共整合了24小时的曝光数据。位在麒麟座方向约有2,500光年远处的锥状星云,其锥形云柱的伸展长度约有7光年。而位在影像顶端之外的大质量恒星NGC 2264 IRS,可能就是雕塑出锥状星云的恒星风之源头。锥状星云外裹的泛红薄纱,则是来自氢气云所散发的泛红辉光。{lamp/}原文:{mtitle title="NGC 2264: The Cone Nebula"/}Image Credit & Copyright: Matthew DieterichExplanation: Stars are forming in the gigantic dust pillar called the Cone Nebula.Cones, pillars, and majesticflowing shapes abound instellar nurseries where clouds of gas and dust are sculpted by energetic winds from newborn stars.The Cone Nebula, a well-known example, lies within the bright galactic star-forming region NGC 2264.The featured image of the Cone was captured recently combining 24-hours of exposure with a half-meter telescope at the El Sauce Observatory in Chile.Located about 2,500 light-years away toward the constellation of the Unicorn (Monoceros), the Cone Nebula's conical pillar extends about 7 light-years.The massive starNGC 2264 IRS, is the likely source of the wind sculpting the Cone Nebula and lies off the top of the image. The Cone Nebula's reddish veil isproduced by glowing hydrogen gas.
2023年01月10日
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2022-11-29
2022年11月29日:超新星遗迹:甘姆星云-(The Gum Nebula Supernova Remnant)
[2022年11月29日:超新星遗迹:甘姆星云-(The Gum Nebula Supernova Remnant)--原图下载](https://apod.nasa.gov/apod/image/2211/Gum_Lima_1365.jpg"onMouseOver="if (document.images)document.imagename1.src='image/2211/Gum_Lima_960_annotated.jpg';"onMouseOut="if (document.images)document.imagename1.src='image/2211/Gum_Lima_960.jpg';){mtitle title="超新星遗迹:甘姆星云"/}Image Credit & Copyright: Victor Lima说明: 因为甘姆星云(Gum Nebula ) 是离地球最近的超新星遗迹,我们反而不容易看到它。虽然甘姆星云在天空的跨幅足足有40度,不过它既大又暗淡 ,所以往往消失在明亮喧嚣的背景里。不过,这幅广角单曝光主题影像,精彩的突显了影像右侧甘姆星云的泛红辐射。此外在视野里,还可见到影像前景的智利.阿塔卡玛沙漠,斜贯过上左方的银河系内之船底大星云,以及邻近的大麦哲伦星系(LMC)。甘姆星云非常邻近,其前缘及后缘分别距离我们450光年和1500光年远。这个複杂的星云位在南天的船尾 座和船帆座方向。怪异的是,甘姆星云仍有许多未知之处,包括超新星爆炸的确切时间,以及到底发生过几次超新星爆炸才形成这个星云。{lamp/}原文:{mtitle title="The Gum Nebula Supernova Remnant"/}Image Credit & Copyright: Victor LimaExplanation: Because the Gum Nebula is the closest supernova remnant, it is actually hard to see. Spanning 40 degrees across the sky, the nebula appears so large and faint that it is easily lost in the din of a bright and complex background. The Gum Nebula is highlighted nicely in red emission toward the right of the featured wide-angle, single-image photograph taken inlate May.Also visible in the frame are the Atacama Desert in Chile in the foreground,the Carina Nebula in the plane of our Milky Way galaxy running diagonally down from the upper left, and the neighboring Large Magellanic Cloud (LMC) galaxy.The Gum Nebula is so close that we are much nearer the front edge than the back edge, each measuring 450 and 1500 light years respectively. The complicated nebula lies in the direction of the constellations of Puppis and Vela. Oddly, much remains unknown about the Gum Nebula, including the timing and even number of supernova explosions that formed it.
2022年11月29日
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