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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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2024-01-01
2024年01月01日:NGC 1232:宏伟的螺旋星系-(NGC 1232: A Grand Design Spiral Galaxy)
2024年01月01日:NGC 1232:宏伟的螺旋星系-(NGC 1232: A Grand Design Spiral Galaxy)--原图下载{mtitle title="NGC 1232:宏伟的螺旋星系"/}Image Credit: FORS,8.2-meter VLT Antu,ESO说明: 星系之所以令人着迷,除了它们具有美丽的外观之外,也因为它们具有不可见的内涵。由极大望远镜之一所拍摄的宏伟螺旋星系NGC 1232,就是一个很好的例证。上面影像里的可见物质,绝大部分是数以百万计的亮星和黝黑的尘埃,以及它们所聚成、绕着星系核心打转的螺旋臂。而蓝色亮星所组成的疏散星团则散布在旋臂上,它们之间夹杂着由緻密星际尘埃所聚成的尘埃带。此外,这个星系还有数十亿颗不显眼但可侦测的恒星及大量的星际气体,它们加总的巨大质量,主宰了星系核心区的动力学行为。不过现行的最可信的学说指出,星系还拥有更大量形态不明的不可见物质。之所有假设有这种弥漫的暗物质之存在,部分原因是要解释星系外围区可见物质的运动。{lamp/}原文:{mtitle title="NGC 1232: A Grand Design Spiral Galaxy"/}Image Credit: FORS,8.2-meter VLT Antu,ESOExplanation: Galaxies are fascinating not only forwhat is visible, but for what is invisible.Grand spiral galaxyNGC 1232,captured in detail by one of the Very Large Telescopes,is a good example. The visible is dominated by millions ofbright stars and darkdust,caught up in a gravitational swirl ofspiral arms revolving about the center.Open clusters containingbright blue stars can be seen sprinkled along these spiral arms,while dark lanesof dense interstellardustcan be seen sprinkled between them.Less visible, but detectable, are billions of dim normalstars and vast tracts ofinterstellar gas,together wielding such high mass that theydominate the dynamics of the innergalaxy. Leading theories indicate that even greater amounts of matter are invisible, in a form we don't yet know.This pervasivedark matter is postulated, in part, to explain themotionsof the visible matter in the outer regions of galaxies.
2024年01月01日
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2023-10-07
2023年10月07日:仙女大星系过去和未来的恆星-(The Once and Future Stars of Andromeda)
[2023年10月07日:仙女大星系过去和未来的恆星-(The Once and Future Stars of Andromeda)--原图下载](https://apod.nasa.gov/apod/image/2310/M31_HubbleSpitzerGendler_2000.jpg"onMouseOver="if (document.images)document.imagename1.src='image/2310/M31_HubbleSubaruGendler_960.jpg';"onMouseOut="if (document.images)document.imagename1.src='image/2310/M31_HubbleSpitzerGendler_960.jpg';){mtitle title="仙女大星系过去和未来的恆星"/}Image Credit: NASA, NSF, NOAJ, Hubble, Subaru,Mayall, DSS, Spitzer; Processing & Copyright: Robert Gendler & Russell Croman说明: 这幅仙女大星系的影像,不仅显示目前恒星之所在,也呈现了未来恒星即将现身的位区。如众所熟知的,庞大美丽的仙女大星系(M31),是个离我们只有2百50万光年远的螺旋星系。这幅很有趣的仙女大星系组合影像,整合了太空与地基望远镜的观测数据,以同时呈现此星系在可见光及非可见光波段的景观。影像里的白与蓝色、呈现哈伯、昴宿、及Mayall望远镜的可见光数据,用以突显M31目前恒星所在的位置。而来自美国航太总署.史匹哲太空望远镜的橙色红外光数据,则显示M31未来的恒星即将形成的区域。红外光数据所显示的,是仙女大星系广袤的螺旋臂上,受到恒星加热的庞然尘埃带。这些尘埃是此星系大量星际气体的示踪物,更是未来恒星形成的原材料。很可确定的是,这些新恒星很可能会形成于接下来的一亿年里,远在约50亿年后仙女座与我们的银河系合併之前。{lamp/}原文:{mtitle title="The Once and Future Stars of Andromeda"/}Image Credit: NASA, NSF, NOAJ, Hubble, Subaru,Mayall, DSS, Spitzer; Processing & Copyright: Robert Gendler & Russell CromanExplanation: This picture of Andromeda shows not only where stars are now, but where stars will be.The big, beautiful Andromeda Galaxy,M31, is a spiral galaxya mere 2.5 million light-yearsaway. Image data from space-based and ground-based observatories have been combined here to produce this intriguing compositeview of Andromeda at wavelengths bothinside and outside normally visible light.The visible lightshows where M31's stars are now, highlighted inwhite and blue hues and imaged by the Hubble, Subaru, and Mayall telescopes. The infrared lightshows where M31's future stars will soon form,highlighted in orange hues and imaged by NASA's Spitzer Space Telescope. The infrared light tracks enormous lanes of dust, warmed by stars, sweeping along Andromeda's spiral arms. This dust is a tracer of the galaxy's vastinterstellar gas, raw material for future star formation. Of course, the new stars will likely form over the next hundred million years or so.That's well before Andromeda merges with our Milky Way Galaxy in about 5 billion years.
2023年10月07日
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2023-04-08
2023年04月08日:M100:宏伟的螺旋星系-(M100: A Grand Design Spiral Galaxy)
2023年04月08日:M100:宏伟的螺旋星系-(M100: A Grand Design Spiral Galaxy)--原图下载{mtitle title="M100:宏伟的螺旋星系"/}Image Credit: NASA, ESA, Hubble;Processing: Judy Schmidt说明: 庞大美丽的M100有宏伟螺旋星系的贴切称号。这个庞然的星系,拥有超过1千亿颗成员星;此外,它也酷似我们的银河系,拥有轮廓鲜明的螺旋臂。亦名为NGC 4321的M100,位在后发座方向,离我们约有5千6百万光年远,是室女座星系团最明亮的星系成员之一。这幅由哈伯太空望远镜第三代广视场相机所拍摄的M100影像,突显了明亮蓝色星团和错综複杂的蜿蜒尘埃带,这些螺旋星系的标誌性特徵。研究星系M100里的变星,对测定宇宙的大小和年龄有重要贡献。{lamp/}原文:{mtitle title="M100: A Grand Design Spiral Galaxy"/}Image Credit: NASA, ESA, Hubble;Processing: Judy SchmidtExplanation: Majestic on a truly cosmic scale, M100 is appropriately known as a grand design spiral galaxy. It is a large galaxy of over 100 billion stars with well-defined spiral arms that is similar to our own Milky Way Galaxy. One of the brightest members of the Virgo Cluster of galaxies, M100 (alias NGC 4321) is 56 million light-years distant toward the constellation of Berenice's Hair (Coma Berenices). This Hubble Space Telescope image of M100 was taken with the Wide Field Camera 3 and accentuates bright blue star clusters and intricate winding dust lanes which are hallmarks of this class of galaxies. Studies of variable stars in M100 have played an important role in determining the size and age of the Universe.
2023年04月08日
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2022-07-31
2022年07月31日:哈伯望远镜的星暴星系M94-(Starburst Galaxy M94 from Hubble)
2022年07月31日:哈伯望远镜的星暴星系M94-(Starburst Galaxy M94 from Hubble)--原图下载{mtitle title="哈伯望远镜的星暴星系M94"/}Image Credit: ESA/Hubble & NASA说明: 为何这个星系有个泛蓝的亮星环?美丽的螺旋星系M94,座落在北天的猎犬座方向,约只有1千5百万光年远之处。这个宽约30,000光年,有螺旋臂扫过其宽广星系盘外围的正向星系,是地球天文学家经常观测的标的之一。不过这幅哈伯太空望远镜影像,只涵盖M94中心约7,000光年的区域。这幅特写主题影像,突显这个星系緻密明亮的星系核、鲜明的内尘埃带、与年轻大质量恒星聚成的精采泛蓝恒星环。这个恒星的年龄可能全都少于1千万年的星环,见证了M94是个正经历狂暴恒星诞生期的星暴星系。而呈环状分布的泛蓝群星,可能是椭圆状核心棒的重力和转动所触发、向外传播的涟漪波前。由于M94相对邻近,天文学家得以能仔细探索它星暴环的详细结构。{lamp/}原文:{mtitle title="Starburst Galaxy M94 from Hubble"/}Image Credit: ESA/Hubble & NASAExplanation: Why does this galaxy have a ring of bright blue stars? Beautiful island universeMessier 94 lies a mere 15 million light-yearsdistant in the northern constellation of the Hunting Dogs(CanesVenatici).A popular target for Earth-based astronomers,the face-on spiral galaxy is about 30,000 light-years across,with spiral arms sweeping through theoutskirts of its broad disk.But this Hubble Space Telescope field of view spans about7,000 light-years across M94's central region.The featured close-up highlights the galaxy's compact,bright nucleus, prominent inner dust lanes, and the remarkable bluish ring of young massive stars.The ring stars are all likely less than 10 million years old, indicating that M94 is a starburst galaxy that is experiencing an epoch of rapid star formationfrom inspiraling gas.The circular ripple of blue stars is likely a wave propagating outward, having been triggered by the gravity and rotation of a oval matter distributions.Because M94 is relatively nearby, astronomers can better exploredetails of its starburst ring.
2022年07月31日
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2022-05-23
2022年05月23日:仙女大星系过去与未来的恆星-(The Once and Future Stars of Andromeda)
[2022年05月23日:仙女大星系过去与未来的恆星-(The Once and Future Stars of Andromeda)--原图下载](https://apod.nasa.gov/apod/image/2205/M31_HubbleSpitzerGendler_2000.jpg"onMouseOver="if (document.images)document.imagename1.src='image/2205/M31_HubbleSubaruGendler_960.jpg';"onMouseOut="if (document.images)document.imagename1.src='image/2205/M31_HubbleSpitzerGendler_960.jpg';){mtitle title="仙女大星系过去与未来的恆星"/}Image Credit: NASA, NSF, NOAJ, Hubble, Subaru, Mayall, DSS, Spitzer; Processing & Copyright: Robert Gendler & Russell Croman说明: 这幅仙女大星系的影像,不仅显示目前恒星所在的位置,也呈现了未来恒星即将现身的区位。如大家所熟知的,庞大美丽的仙女大星系(M31),是个离我们只有2百50万光年远的螺旋星系。这幅很有趣的仙女大星系组合影像,整合了太空与地基望远镜的观测数据,以同时呈现此星系在可见光及非可见光波段的景观。影像里白色与蓝色、来自哈伯、昴宿、及Mayall望远镜的可见光数据,突显M31目前恒星所在的位置。而来自美国航太总署.史匹哲太空望远镜的橙色红外光数据,则显示M31未来的恒星即将形成的区域。红外光数据所显示的,是仙女大星系广袤的螺旋臂上,受到恒星加热的庞然尘埃带。这些尘埃是此星系大量星际气体的示踪剂,更是未来恒星形成的原材料。很可确定的,这些新恒星很可能会形成于接下来的一亿年内,远在约50亿年后仙女座与我们的银河系合併之前。{lamp/}原文:{mtitle title="The Once and Future Stars of Andromeda"/}Image Credit: NASA, NSF, NOAJ, Hubble, Subaru, Mayall, DSS, Spitzer; Processing & Copyright: Robert Gendler & Russell CromanExplanation: This picture of Andromeda shows not only where stars are now, but where stars will soon be.Of course, the big, beautiful Andromeda Galaxy, M31, is a spiral galaxy -- and a mere 2.5 million light-years away. Both space-based and ground-based observatories have been here combined to produce this intriguing composite image of Andromeda, at wavelengths both inside and outside normally visible light.The visible light shows where M31's stars are now -- as highlighted in white and blue hues and imaged by the Hubble, Subaru, and Mayall telescopes. The infrared light shows where M31's future stars will soon form -- as highlighted in orange hues and imaged by NASA's Spitzer Space Telescope. The infrared light tracks enormous lanes of dust, warmed by stars, sweeping along Andromeda's spiral arms. This dust is a tracer of the galaxy's vast interstellar gas -- the raw material for future star formation. These new stars will likely form over the next hundred million years, surely well before Andromeda merges with our Milky Way Galaxy in about 5 billion years.
2022年05月23日
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2022-05-17
2022年05月17日:NGC 1316:星系碰撞之后-(NGC 1316: After Galaxies Collide)
2022年05月17日:NGC 1316:星系碰撞之后-(NGC 1316: After Galaxies Collide)--原图下载{mtitle title="NGC 1316:星系碰撞之后"/}Image Credit & Copyright: Capture: Greg Turgeon; Processing: Kiko Fairbairn说明: 在试图了解NGC 1316这类令人惊讶的天体之成因时,天文学家就变身为侦探。他们的侦察显示,身为庞大椭圆星系的NGC 1316,大约在1亿年前,开始吞食影像右上方的邻近较娇小之螺旋星系 NGC 1317。支持的证据包括螺旋星系的特徵性黝黑尘埃带,以及在这幅广角深空影像里,清楚可见的昏暗恒星和气体涡旋和壳层结构。有一项尚待解答的问题为:以暗淡光点之姿散布在影像各处的球状星团,为何如此娇小?因为大部分的椭圆星系,都拥有比NGC 1316 数量更多、亮度更高的球状星团。而这些观测到的球状星团非常年老,不可能是最近和螺旋星系碰撞后才形成的。假说之一指称,这些球状星团,是更先前另一个被NGC 1316吞併的螺旋星系所遗留下来的。NGC 1316另一个令人惊讶的结构为天炉A,一团在电波波段非常明亮的庞大瓣状气体。{lamp/}原文:{mtitle title="NGC 1316: After Galaxies Collide"/}Image Credit & Copyright: Capture: Greg Turgeon; Processing: Kiko FairbairnExplanation: Astronomers turn detectives when trying to figure out the cause of startling sights like NGC 1316. Investigations indicate that NGC 1316is an enormous elliptical galaxy that started, about 100 million years ago, to devour a smaller spiral galaxy neighbor, NGC 1317, just on the upper right.Supporting evidence includes the dark dust lanes characteristic of aspiral galaxy,and faint swirls and shells of stars and gas visible in this wide and deep image.One thing that >remains unexplained is the unusually small globular star clusters, seen as faint dots on the image.Most elliptical galaxies have more and brighter globular clusters thanNGC 1316. Yet the observed globulars are too old to have been created by the recent spiral collision. One hypothesis is that these globulars survive from an even earlier galaxy that was subsumed into NGC 1316.Another surprising attribute of NGC 1316, also known as Fornax A, is its giant lobes of gas that glow brightly in radio waves.
2022年05月17日
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