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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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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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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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2025-01-13
2025年01月13日:日出前的阿特拉斯彗星-(Comet ATLAS Before Sunrise)
2025年01月13日:日出前的阿特拉斯彗星-(Comet ATLAS Before Sunrise)--原图下载{mtitle title="日出前的阿特拉斯彗星"/}Image Credit & Copyright: Petr Horalek /Institute of Physics in Opava说明: 阿特拉斯彗星(C/2024 G3 ATLAS)现在非常明亮,不过,也非常接近太阳。若非受到太阳炫光的影响,这颗彗星会是近年来最壮观的彗星之一,它反射到地球的阳光之亮度,与去年10月的紫金山-阿特拉斯彗星相当,而它目前的亮度也堪与金星 媲美。 然而,这颗庞大的雪球极靠近太阳,目前隐没在清晨的曙光或傍晚的暮光中。今天,阿特拉斯彗星将运行到最接近太阳的近日点。 虽然彗星未来的亮度极难预测,但如果阿特拉斯彗星近距离通过太阳后,能存活下来,它有机会成为肉眼可见的彗星,并在接下来的数星期中,成为绝佳的相机拍摄标的。这幅主题影像,是在昨天清晨摄于斯洛伐克的托纳拉镇附近。{lamp/}原文:{mtitle title="Comet ATLAS Before Sunrise"/}Image Credit & Copyright: Petr Horalek /Institute of Physics in OpavaExplanation: Comet ATLAS is really bright now, but also really close to the Sun.Outside the glow of the Sun, Comet C/2024 G3 (ATLAS) would be one of the more remarkable comet sights of recent years, reflecting about as much sunlight to Earth as Comet Tsuchinshan-ATLAS did in October, and now rivaling even planet Venus.But the giant snowball is now so close to the Sun that it can only be seen through the light of the early morning dawn or the early evening dusk.Today, Comet ATLAS is at perihelion -- its closest ever to the Sun. Although the future brightness of comets is notoriously hard to predict, there is hope that Comet ATLAS will survive its close pass near the Sun and remain bright enough to be seen with the unaided eye over the next few days -- and possibly a good camera comet for weeks.The featured image was taken early yesterday morning near Tornaľa, Slovakia.
2025年01月13日
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2024-10-09
2024年10月09日:M106:有奇特核心的螺旋星系-(M106: A Spiral Galaxy with a Strange Center)
2024年10月09日:M106:有奇特核心的螺旋星系-(M106: A Spiral Galaxy with a Strange Center)--原图下载{mtitle title="M106:有奇特核心的螺旋星系"/}Image Credit & Copyright: Ali Al Obaidly说明: 螺旋星系M106的核心发生了什么事?M106是个由螺旋状恒星盘和气体所聚成的星系,外观上的主要特徵为两道明亮的螺旋臂及核心附近的黝黑尘埃带,如上面这张摄于科威特 沙漠的主题影像所示。M106的核心在无线电波和X射线波段都很明亮,更有2道源自核心、长度和星系宽度相当的喷流。它异常明亮的核心,咸认源自大量掉入核心超大质量黑洞的云气所发出的辉光,而M106也是离我们最近的西佛星系之一。 亦名为NGC 4258的M106,和我们相对邻近,只有2千350万光年远,大小则约为6万光年,用小望远镜就能在北天的猎犬 座方向看见它。{lamp/}原文:{mtitle title="M106: A Spiral Galaxy with a Strange Center"/}Image Credit & Copyright: Ali Al ObaidlyExplanation: What's happening at the center of spiral galaxy M106?A swirling disk of stars and gas, M106's appearance is dominated by blue spiral arms and red dust lanes near the nucleus, as shown in the featured image taken from the Kuwaiti desert. The core of M106 glows brightly in radio waves and X-rays where twin jets have been found running the length of the galaxy. An unusual central glow makes M106 one of the closest examples of the Seyfert class of galaxies, where vast amounts of glowing gas are thought to be falling into a central massive black hole. M106, also designated NGC 4258, is a relatively close 23.5 million light years away, spans 60 thousand light years across, and can be seen with a small telescope towards the constellation of the Hunting Dogs (Canes Venatici).
2024年10月09日
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2024-02-18
2024年02月18日:霍格天体 : 近乎完美的环状星系-(Hoag's Object: A Nearly Perfect Ring Galaxy)
2024年02月18日:霍格天体 : 近乎完美的环状星系-(Hoag's Object: A Nearly Perfect Ring Galaxy)--原图下载{mtitle title="霍格天体 : 近乎完美的环状星系"/}Image Credit: NASA, ESA, Hubble; Processing: Benoit Blanco说明: 这是一个星系还是两个?在1950年,当天文学家霍格偶然发现这个不寻常的河外天体后,大家就得面对这个问题。 这个天体醒目的外环,主要是由明亮的泛蓝恒星所组成,中心的球核,主要的成员是可能远更老的泛红恒星,而一道几乎完全黝黑的缝隙横亘在二者之间。霍格天体是如何形成的,包括它的恒星和气体为何会聚成近乎完美的圆环,至今仍然不明。众多的形成假说之一认为:数十亿年前发生过星系碰撞,而原先造成这种重力效应的核心棒后来消失了。 这幅主题影像是由哈伯太空望远镜所拍摄的,最近再用人工智慧的去噪讯演算法重新处理过。 不过,无线电波段的观测指出,在过去数十亿年之间,霍格天体并未吸积另一个小星系。 霍格天体位于北天的巨蛇 座方向,大小约有100,000光年,距离则在6亿光年左右。 在影像右侧可见到许多远在后方的星系,而且很凑巧的,在暗隙的七点钟方向,还有另一个更遥远的环状星系。(Hoag's Object 霍格天体){lamp/}原文:{mtitle title="Hoag's Object: A Nearly Perfect Ring Galaxy"/}Image Credit: NASA, ESA, Hubble; Processing: Benoit BlancoExplanation: Is this one galaxy or two? This question came to light in 1950 when astronomerArthur Hoagchanced upon this unusual extragalactic object. On the outside is aring dominated by bright blue stars,while near the center lies a ball of much redder starsthat are likely much older. Between the two is agap that appears almost completely dark. How Hoag's Object formed, including its nearly perfectly round ring of stars and gas, remains unknown. Genesis hypotheses include agalaxy collisionbillions of years ago and the gravitational effect of acentral bar that hassince vanished.The featured photo was taken by theHubble Space Telescopeand reprocessed using an artificially intelligent de-noising algorithm. Observations in radio waves indicate that Hoag's Object has not accreted a smaller galaxy in the past billion years. Hoag's Object spans about 100,000light years and lies about 600 million light years away toward the constellation of the Snake(Serpens). Many galaxies far in the distance are visible toward the right, while coincidentally, visible in the gap at about seven o'clock, is another but more distant ring galaxy.
2024年02月18日
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2024-01-28
2024年01月28日:冥王星的真实色泽-(Pluto in True Color)
2024年01月28日:冥王星的真实色泽-(Pluto in True Color)--原图下载{mtitle title="冥王星的真实色泽"/}Image Credit: NASA, JHU APL, SwRI;Processing: Alex Parker说明: 冥王星的真实色泽是什么? 科学家颇费了一些功夫才获得答案。纵然新视野号太空船在2015年掠过冥王星时,回传了大量的影像,但要处理这些在摄于多波段的影像,以近似人类的肉眼之所见,是件很有挑战性的工作。在新视野号取得原始数据的三年后,工作的成果如这幅主题影像所示,同时它也是至今冥王星最高分辨率的真实色泽影像。影像中,可见到淡色的心形汤博区,而西半球则是意外平滑由氮冰覆盖的史泼尼克高原。新视野号发现这颗矮行星,具有由色泽略有差异的多个区域组成之複杂表面。不过整体来说,冥王星近乎棕色,而它暗沉的色泽,主要来自被太阳紫外光催化的少量表面甲烷。{lamp/}原文:{mtitle title="Pluto in True Color"/}Image Credit: NASA, JHU APL, SwRI;Processing: Alex ParkerExplanation: What color is Pluto, really?It took some effort to figure out. Even given all of the images sent back to Earth when the robotic New Horizons spacecraft sped past Pluto in 2015, processing these multi-spectral frames to approximate what the human eye would see was challenging.The result featured here, released three years after the raw data was acquired by New Horizons, is the highest resolution true color image of Pluto ever taken.Visible in the image is the light-colored, heart-shaped, Tombaugh Regio, with the unexpectedly smooth Sputnik Planitia, made of frozen nitrogen, filling its western lobe.New Horizons found the dwarf planet to have a surprisingly complex surface composed of many regions having perceptibly different hues. In total, though, Pluto is mostly brown, with much of its muted color originating from small amounts of surface methane energized by ultraviolet light from the Sun.
2024年01月28日
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2024-01-21
2024年01月21日:1938年上密西根半岛的暴风雪-(The Upper Michigan Blizzard of 1938)
2024年01月21日:1938年上密西根半岛的暴风雪-(The Upper Michigan Blizzard of 1938)--原图下载{mtitle title="1938年上密西根半岛的暴风雪"/}Image Credit: Bill Brinkman; Courtesy: Paula Rocco说明: 你见过的暴风雪威力有这么大吗?在1938年,上密西根半岛世纪暴风雪期间,有些积雪的高度几乎和电线桿等高。86年前的这场风暴,很意外的在头两天就降下将近1公尺深的新雪。当大雪纷飞时,强阵风接着把雪堆叠到难以想像的高度,不但造成许多道路难以通行,就连除雪也成了不可能的任务。于是,除了居民寸步难行之外,轿车、校车和火车都深陷白雪里。更惨的是,当时还发生了一场大火;万幸这场雪灾和火灾只造成2人丧生,不过,有些学生困在学校里达数天之久。上面这张主题影像,是当地的一位居民摄于暴风雪刚过之后。这些大雪最后都消融了,然而,在地球雪区这种规模的连续暴雪,则有助于形成永久的冰川。{lamp/}原文:{mtitle title="The Upper Michigan Blizzard of 1938"/}Image Credit: Bill Brinkman; Courtesy: Paula RoccoExplanation: Yes, but can your blizzard do this?In the Upper Peninsula of Michigan's Storm of the Century in 1938, some snow drifts reached the level of utility poles.Nearly a meter of new and unexpected snow fell over two days in a storm that started 86 years ago this week. As snow fell and gale-force winds piled snow to surreal heights, many roads became not only impassable but unplowable; people became stranded, cars, school buses and a train became mired, and even a dangerous fire raged.Two people were killed and some students were forced to spend several consecutive days at school. The featured image was taken by a local resident soon after the storm.Although all of this snow eventually melted, repeated snow storms like this help build lasting glaciers in snowy regions of our planet Earth.
2024年01月21日
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2023-12-19
2023年12月19日:NGC 1499:加州星云-(NGC 1499: The California Nebula)
2023年12月19日:NGC 1499:加州星云-(NGC 1499: The California Nebula)--原图下载{mtitle title="NGC 1499:加州星云"/}Image Credit & Copyright: Steven Powell说明: 太空中难道真的有卡拉菲亚女王的神话岛屿吗?或许没有,不过这团分子云的轮廓,倒真的形似美国的加州。而我们位在银河猎户臂里的太阳,离加州星云大约只有1,000光年远。亦名为NGC 1499的这团经典发射星云,长度约有100光年。在这幅主题影像里,加州星云最醒目的泛红色泽,来自氢原子被高能星光电离后后,氢离子和失去的电子复合时所发出的特徵红光。而发出高能星光 电离大部分云气的恒星,极可能是位于星云右侧的明亮炽热色泽泛蓝的卷舌三(英仙座Xi星)。经常是天文摄影者拍照目标的加州星云,在幽暗的天空下,用大视野望远镜即可在英仙座方向离昴宿星团不远处找到它。{lamp/}原文:{mtitle title="NGC 1499: The California Nebula"/}Image Credit & Copyright: Steven PowellExplanation: Could Queen Calafia's mythical island exist in space?Perhaps not, but by chance the outline of this molecular space cloud echoes the outline of the state of California, USA.Our Sun has its home within the Milky Way'sOrionArm, only about 1,000 light-years from the California Nebula.Also known as NGC 1499, the classic emission nebula is around 100 light-years long.On the featured image, the most prominent glow of the California Nebula is the red light characteristic of hydrogen atoms recombining with longlost electrons, stripped away (ionized) by energetic starlight.The star most likely providing the energetic starlight that ionizes much of the nebular gas is the bright, hot, bluish Xi Perseijust to the right of the nebula. A regular target for astrophotographers, the California Nebula can be spotted with a wide-field telescope under a dark skytoward the constellation of Perseus, not far from the Pleiades.
2023年12月19日
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