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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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2022-12-06
2022年12月06日:韦伯:M16的恆星形成之柱-(M16: A Star Forming Pillar from Webb)
2022年12月06日:韦伯:M16的恆星形成之柱-(M16: A Star Forming Pillar from Webb)--原图下载{mtitle title="韦伯:M16的恆星形成之柱"/}Image Credit: NASA,ESA,CSA,STScI, Processing & Copyright: Mehmet Hakan Özsaraç说明: 这座星际山峰之内发生了什么事?恒星正形成于其中。这座宇宙山峰,其实是美丽的老鹰星云(M16)里的气体与尘埃柱。这种云柱的密度很低,你可轻易的穿过它,而它之所以看起来形似坚柱,是因为它含有大量的尘埃,而且极厚。云柱里的亮区是受到内部新诞生的恒星之照耀。这些亮区看似只发出明亮的红光及红外光,则是因为蓝光都被居间的星际尘埃给散射了。这幅呈现云柱前所未见细微结构的主题影像,是由去年底发射的韦伯太空望远镜(JWST)不久前在近红外波段拍摄的。这些年轻恒星发出的高能星光、侵蚀性的恒星风、以及最后死亡时的超新星爆炸,会在接下来的100,000年里慢慢摧毁这根恒星诞生之柱。{lamp/}原文:{mtitle title="M16: A Star Forming Pillar from Webb"/}Image Credit: NASA,ESA,CSA,STScI, Processing & Copyright: Mehmet Hakan ÖzsaraçExplanation: What’s happening inside this interstellar mountain?Stars are forming.The mountain is actually a column of gas and dust in the picturesque Eagle Nebula (M16). A pillar like this is so low in density that you could easily fly though it -- it only appears solid because of its high dust content and great depth.The glowing areas are lit internally by newly formed stars.These areas shine in red and infrared light because blue light is scattered away by intervening interstellar dust.The featured image was captured recently in near-infrared light in unprecedented detail by the James Webb Space Telescope (JWST), launched late last year.Energetic light, abrasive winds, and final supernovas from these young stars will slowly destroy this stellar birth column over the next 100,000 years.
2022年12月06日
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2022-05-08
2022年05月08日:螺旋星系NGC 1512的内环-(Spiral Galaxy NGC 1512: The Inner Rings)
2022年05月08日:螺旋星系NGC 1512的内环-(Spiral Galaxy NGC 1512: The Inner Rings)--原图下载{mtitle title="螺旋星系NGC 1512的内环"/}Image Credit: NASA, ESA, Hubble Space Telescope说明: 大部分的星系没有环结构,然而,为何这个星系有二个环呢?首先,NGC 1512中心的亮带是核心环,一道由新诞生的恒星所聚成、环拱在星系中心周围的亮环。不过,影像中大部分的恒星和相伴的气体和尘埃,都在靠近影像边缘的环上,并绕着星系的中心运行;而与直觉相违的是,这道环却称为是内环。如果仔细检视,就会发见现内环与水平横贯星系的弥漫中心棒之二端相连。这些环结构,可能是NGC 1512在一种称为拉伸的长期演化过程中,因为本身的不对称性所造成的。这种星系的不对称结构和它们恒星棒的产生的重力,会造成气体和尘埃从内环掉向核心环,提高核心环的恒星形成率。有些螺旋星系甚还有第三个环,而这个外环在更外围之处环拱着整个星系。{lamp/}原文:{mtitle title="Spiral Galaxy NGC 1512: The Inner Rings"/}Image Credit: NASA, ESA, Hubble Space TelescopeExplanation: Most galaxies don't have any rings -- why does this galaxy have two? To begin, the bright band near NGC 1512's center is a nuclear ring, a ring that surrounds the galaxy center and glows brightly with recently formed stars.Most stars and accompanying gas and dust, however, orbit the galactic center in a ring much further out -- here seen near the image edge.This ring is called, counter-intuitively, the inner ring. If you look closely, you will see this the inner ring connects ends of a diffuse central bar that runs horizontally across the galaxy.These ring structures are thought to be caused by NGC 1512's own asymmetries in a drawn-out process called secular evolution. The gravity of these galaxy asymmetries, including the bar of stars, cause gas and dust to fall from the inner ring to the nuclear ring, enhancing this ring's rate of star formation. Some spiral galaxies also have a third ring -- an outer ring that circles the galaxy even further out.
2022年05月08日
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2017-08-07
2017年08月07日:螺旋星系NGC 1512的内环-(Spiral Galaxy NGC 1512: The Inner Ring)
2017年08月07日:螺旋星系NGC 1512的内环-(Spiral Galaxy NGC 1512: The Inner Ring)--原图下载{mtitle title="螺旋星系NGC 1512的内环"/}Image Credit: NASA, ESA, Hubble Space Telescope说明: 大部分的星系没有环结构,然而,为何这个星系有二个环呢?首先,NGC 1512中心的亮带是核心环,一道由新诞生的恒星所聚成、环拱在星系中心周围的亮环。不过,影像中大部分的恒星和相伴的气体和尘埃,都在接近影像边缘的环上,绕着星系中心运行;而与直觉相违的是,这道环却称为是内环。如果你仔细看,就会发见现内环与水平横贯星系的弥漫中心棒之二端相连。这些环结构,可能是NGC 1512在一种称为拉伸的长期演化过程中,因为本身的不对称性所造成的。这种星系的不对称结构和它们恒星棒的产生的重力,会造成气体和尘埃从内环掉向核心环,提高了核心环的恒星形成率。有些螺旋星系甚还有第三个环,这个外环在更外围之处环拱着整个星系。{lamp/}原文:{mtitle title="Spiral Galaxy NGC 1512: The Inner Ring"/}Image Credit: NASA, ESA, Hubble Space TelescopeExplanation: Most galaxies don't have any rings -- why does this galaxy have two? To begin, the bright band near NGC 1512's center is a nuclear ring, a ring that surrounds the galaxy center and glows brightly with recently formed stars.Most stars and accompanying gas and dust, however, orbit the galactic center in a ring much further out -- here seen near the image edge.This ring is called, counter-intuitively, the inner ring. If you look closely, you will see this
2017年08月07日
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2010-01-07
2010年01月07日:小麦哲伦星系的长尾-(The Tail of the Small Magellanic Cloud)
2010年01月07日:小麦哲伦星系的长尾-(The Tail of the Small Magellanic Cloud)--原图下载{mtitle title="小麦哲伦星系的长尾"/}Credit: NASA /JPL-Caltech /STScI说明: 以16世纪航海家Ferdinand Magellan命名的小麦哲伦星系 (Small MagellanicCloud),是我们银河系的卫星星系,同时也是南天夜空中的珍宝。这个位在杜鹃座 (Tucana)的小型不规则星系,离我们约有二十万光年。在光学望远镜所拍摄的影像中,它的成员星、云气和尘埃集结成中心的棒状和侧展出去的翼状结构。然而,在这幅来自史匹哲太空望远镜的红外组合假色影像里,除了较熟悉的棒和翼构造之外,这个星系还有向右延伸的尾部结构。这个可能是被(银河系)潮汐力拉出去的尾部结构,主要成份是云气、尘埃和新诞生的恒星。尾部结构中的二处红色亮斑,是新诞生星团加热周围尘埃云气的产物。{lamp/}原文:{mtitle title="The Tail of the Small Magellanic Cloud"/}Credit: NASA /JPL-Caltech /STScIExplanation: A satellite galaxy of our Milky Way, theSmall MagellanicCloud is wonder of the southern sky, named for 16th century Portuguesecircumnavigator Ferdinand Magellan.Some 200,000 light-years distant in the constellation Tucana,the small irregular galaxy's stars, gas, and dust that lie alonga bar and extended "wing", are familiar in imagesfrom optical telescopes.But the galaxy also has a tail.Explored in thisfalse-color, infrared mosaic from theSpitzer Space Telescope,the tail extends to the right of the more familiar bar and wing.Likely stripped from the galaxy by gravitational tides, the tailcontains mostly gas, dust, andnewly formed stars.Two clusters of newly formed stars, warming their surroundingnatal dust clouds, are seen in the tail as red spots.
2010年01月07日
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1999-06-04
1999年06月04日:NGC 3603: 从诞生到死亡-(NGC 3603: From Beginning To End)
1999年06月04日:NGC 3603: 从诞生到死亡-(NGC 3603: From Beginning To End)--原图下载{mtitle title="NGC 3603: 从诞生到死亡"/}Credit: Wolfgang Brandner (JPL/IPAC),Eva K. Grebel (U. Wash.),You-Hua Chu (UIUC),NASA说明: 这张绝妙的哈伯望远镜照片,所显现的是银河发射星云NGC 3603附近天区的景象。在这个区域内,可以看到恒星的一生;从诞生到死亡的完整故事。让我们从恒星的诞生开始说吧!照片右方很显眼的发光氢气柱,暗示着新诞生的恒星,正要从它们诞生的緻密气态"育婴室"露出来。位在右上方,较不引人注意的暗星云或包克云球 (Bok globules),可能是在即将塌缩成原恒星的阶段。照片中央这团明亮炽热的蓝色恒星,它们强烈的恒星风和紫外辐射,已经把诞生它们的云气清除乾净。大质量的年轻恒星,很快地就会用完它们的燃料。位在星团上左方的明亮超巨星Sher 25,已经在它生命的末期,它的周围环绕着一个亮环,而侧面有它排放出去的气团。这个环的结构,让我们想起超新星1987a,而Sher 25可能只能再活数千年,就会壮烈成仁。有没有行星的故事呢?请看星团下方靠近照片底端的两颗泪滴状天体,这两个发射星云和在猎户座星云所发现的原行星盘 (proto-planetary disks, proplyds)相似,只是体积较大而已。{lamp/}原文:{mtitle title="NGC 3603: From Beginning To End"/}Credit: Wolfgang Brandner (JPL/IPAC),Eva K. Grebel (U. Wash.),You-Hua Chu (UIUC),NASAExplanation: From beginning to end, different stages of a star's life appear inthis exciting Hubble Space Telescope picture of the environsof galactic emission nebulaNGC 3603.For the beginning, eye-catching "pillars" of glowinghydrogen at the right signalnewborn stars emergingfrom their dense, gaseous, nurseries.Less noticeable,dark cloudsor "Bok globules" at the topright corner are likely part of a still earlier stage, prior to theircollapse to form stars.At picture center lies a cluster of brighthot blue stars whose strongwinds and ultraviolet radiation have cleared away nearby material.Massive and young, they will soon exhaust their nuclear fuel.Nearing the end of its life, the bright supergiantstar Sher 25 isseen above and left of the cluster, surrounded by a glowing ring and flankedby ejected blobs of gas.The ring structure is reminiscent ofSupernova 1987a and Sher 25itself may be only a few thousand years from itsown devastating finale.But what about planets?Check out the twoteardrop-shaped objects below the clustertoward the bottom of the picture.Although larger, these emission nebulae are similar to suspectedproto-planetary disks (proplyds) encompassing stars in the Orion Nebula.
1999年06月04日
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