mant[楼主]

探索宇宙! 发布一些有专业天文学家的简短解释和说明的反映我们迷人宇宙的不同影像或照片。

启迪各位伟大的脑袋瓜~~~

cena_comp800.jpg (235.65 KB)
活动星系半人马座A

2008-5-21 15:56

2008 January 10
Active Galaxy Centaurus A
活动星系半人马座A

Credit: X-ray - NASA, CXC, R.Kraft (CfA), et al.;
Radio - NSF, VLA, M.Hardcastle (U Hertfordshire) et al.; Optical - ESO, M.Rejkuba (ESO-Garching) et al.


影像提供：X射线 - NASA, CXC, R.Kraft (CfA), et al.;
射电- NSF, VLA, M.Hardcastle (U Hertfordshire) et al.; 可见光 - ESO, M.Rejkuba (ESO-Garching) et al.

Explanation: A mere 11 million light-years away, Centaurus A is a giant elliptical galaxy - the closest active galaxy to Earth. This remarkable composite view of the galaxy combines image data from the x-ray ( Chandra), optical(ESO), and radio(VLA) regimes. Centaurus A's central region is a jumble of gas, dust, and stars in optical light, but both radio and x-ray telescopes trace a remarkable jet of high-energy particles streaming from the galaxy's core. The cosmic particle accelerator's power source is a black hole with about 10 million times the mass of the Sun coincident with the x-ray bright spot at the galaxy's center. Blasting out from the active galactic nucleus toward the upper left, the energetic jet extends about 13,000 light-years. A shorter jet extends from the nucleus in the opposite direction. Other x-ray bright spots in the field are binary star systems with neutron stars or stellar mass black holes. Active galaxy Centaurus A is likely the result of a merger with a spiral galaxy some 100 million years ago.

说明：巨大的椭圆星系半人马座A距离我们近1,100光年远，也是距离地球最近的活动星系。这张壮观的合成影像中，合成星系影像的数据分别来自X射线（钱德拉），可见光（ESO），和射电（VLA）下拍摄得到。在可见光下，半人马座A的中心区域由气体、尘埃以及恒星混合而成，但在射电和X射线望远镜下都能看到从星系核内喷射出一道壮观的高能微粒喷流。宇宙微粒加速器的能量源是一个黑洞，质量大约是太阳的1,000万倍，就是X射线下星系核中央的蓝点。高能喷流从活动星系核喷向影像左上方，一直延长大约有1.3万光年远。而从星系核爆发的另一个较小的喷流朝向反方向。在这片区域中，其它X射线下的亮点是拥有中子星和黑洞的双星系统。活动星系半人马座A可能是1亿年前与一个旋涡星系合并而成。

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像蝴蝶？像蜻蜓。。。浩瀚的宇宙，五彩斑斓却让人感觉到宁静。。。


[ 本帖最后由 mant 于 2008-5-21 16:17 编辑 ]

mant[楼主]

启迪各位伟大的脑袋瓜，欢迎欣赏。

放松下、在空旷的宇宙里找找灵感，找找清净吧。

mant[楼主]

Polaris Dust Nebula
北极星尘埃星云

Image Credit & Copyright: Steve Mandel (Hidden Valley Observatory)
Research Collaboration: Adolf Witt (University of Toledo) et al.
影像提供及版权：Steve Mandel (Hidden Valley Observatory)
合作研究：Adolf Witt (University of Toledo) et al.

Explanation: Centered on North Star Polaris, this 4 degree wide field of view covers part of a complex of relatively unfamiliar, diffuse dust clouds soaring high above the plane of our Milky Way Galaxy. The combined light of the Milky Way stars are reflected by the dusty, galactic cirrus, the reflected starlight having the same blue tint characteristic of better known reflection nebulae. But this deep color image also records a faint reddish luminescence from the dust grains as they convert invisible stellar ultraviolet radiation to visible red light. Dubbed extended red emission, the dim cosmic glow is thought to be caused by complex organic molecules known as PAHs (polycyclic aromatic hydrocarbons), common constituents of interstellar dust. On planet Earth, PAHs are widely encountered as the sooty products of combustion.
说明：在这张宽4度的广域影像中，中心是北极星，还包含了部分相对生疏且较模糊的复杂尘埃云，高高地漂浮在我们银河系盘面上。银河系恒星发出的光经过尘埃，星系卷云反射后混合在一起，反射星光有一种同样的特征色彩，它们被称为反射星云。但是在这张颜色深暗的影像中，还拍摄到从尘埃发出的昏暗而又略带红色的发光带，它们将不可见的恒星紫外线转变成了可见的红光。那暗淡的宇宙光热被称为广延红色辐射，其被认为是复杂有机分子多环芳烃PAHs，它也是普通的星际尘埃组成成分。在地球上，燃烧之后经常能出现焦黑色的产物那就是多环芳烃。

PolarisNebula_mandel.jpg (661.44 KB)

2008-5-21 16:00

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漂浮在宁静里，没有声音，却异彩纷呈。

[ 本帖最后由 mant 于 2008-5-21 16:18 编辑 ]

mant[楼主]

Hurricane Ivan from the Space Station
远征9队成员，国际空间站上，美国航天局

Credit: Expedition 9 Crew, International Space Station, NASA
Explanation: Ninety percent of the houses on Grenada were damaged by the destructive force of Hurricane Ivan. At its peak, Ivan was a Category 5 hurricane, the highest power category on the Saffir-Simpson Scale, and created sustained winds in excess of 200 kilometers per hour. Ivan was the largest hurricane to strike the US in 2004, and, so far, the 10th most powerful in recorded history. As it swirled in the Atlantic Ocean, the tremendous eye of Hurricane Ivan was photographed from above by the orbiting International Space Station. The name Ivan has now been retired from Atlantic Ocean use by the World Meteorological Organization. Note: Astronomy lectures by an APOD editor are now available as a free podcast.

解释： 90 ％的屋宇，格林纳达被损坏，由毁灭性力量的飓风伊万。在其高峰期，伊万是第5类飓风，最高权力的类别，该saffir -辛普森的规模，创造了持续风速超过了200公里的时速。伊万是最大的飓风打击美国在2004年，而且，直至目前为止，第十最强大的，在有记载的历史。因为它swirled在大西洋，巨大的眼睛飓风伊万被X拍从上述由轨道国际空间站。名称伊万现在已经退休，从大西洋使用由世界气象组织。注：天文学讲座，由一apod编辑器，现已成为一个自由播客。

ivan_iss.jpg (270.86 KB)

2008-5-21 16:06

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换个角度看世界，生命如此渺小。

[ 本帖最后由 mant 于 2008-5-21 16:19 编辑 ]

mant[楼主]

CFHT望远镜下的茧状星云
Credit & Copyright: Jean-Charles Cuillandre (CFHT), Hawaiian Starlight, CFHT

影像提供及版权：Jean-Charles Cuillandre (CFHT), Hawaiian Starlight, CFHT

Explanation: What creates the colors of the Cocoon Nebula? The Cocoon Nebula, cataloged as IC 5146, is a strikingly beautiful nebula located about 4,000 light years away toward the constellation of the Swan (Cygnus). Inside the Cocoon Nebula is a newly developing open cluster of stars. Like other stellar nurseries, the Cocoon Nebula holds, at the same time, a bright red emission nebula, blue reflection nebulas, and dark absorption nebulas. Given different mixtures, these three processes create a host of colors in this image taken recently by the Canada-France-Hawaii Telescope (CFHT) in Hawaii, USA. Speculation based on recent measurements holds that the massive star towards the left of the picture opened a hole in an existing molecular cloud through which much of the glowing material flows. The same star, which formed about 100,000 years ago, now provides the energy source for much of the emitted and reflected light from this nebula.
说明：茧状星云的颜色是由什么形成的？茧状星云被编录为IC5146，是距离我们大约4,000光年远，位于天鹅座内的一个美丽而壮观的星云。茧状星云内部有一个正新形成的疏散星团。就像其它恒星孕育场一样，茧状星云同时具有明亮的红色发射星云，蓝色的反射星云以及黑暗的吸收星云的角色。星云不同的形成过程能释放出不同的混合物质，这就形成了这张影像中众多的颜色，影像是由位于美国夏威夷上的加拿大-法国-夏威夷望远镜（CFHT）近期拍摄。基于最近探测得到的数据推测，影像左侧大质量恒星在分子云中打开了一个洞，而炽热物质从中流出。诞生于10万年前的那颗恒星现今正为星云内发出的放射光和反射光提供能源。　

xin_50ea7e8be2964e6ab719f60d3e34662b_cocoon_cfht.jpg (473.97 KB)

2008-5-21 16:09

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十万年前天空之外的一场盛宴，那时的观众又是谁？

[ 本帖最后由 mant 于 2008-5-21 16:20 编辑 ]

mant[楼主]

xin_ec631e2831444e6b90bf141beafcd7d2_demL316_gemini.jpg (473.74 KB)

2008-5-21 16:10

Double Supernova Remnants DEM L316
双超新星遗迹DEM L316

Credit & Copyright: Gemini Observatory, GMOS-South, NSF
影像提供及版权：Gemini Observatory, GMOS-South, NSF

Explanation: Are these two supernova shells related? To help find out, the 8-meter Gemini Telescope located high atop a mountain in Chile was pointed at the unusual, huge, double-lobed cloud dubbed DEM L316. The resulting image, shown above, yields tremendous detail. Inspection of the image as well as data taken by the orbiting Chandra X-Ray Observatory indicate how different the two supernova remnants are. In particular, the smaller shell appears to be the result of Type Ia supernova where a white dwarf exploded, while the larger shell appears to be the result of a Type II supernova where a massive normal star exploded. Since those two stellar types evolve on such different time scales, they likely did not form together and so are likely not physically associated. Considering also that no evidence exists that the shells are colliding, the two shells are now hypothesized to be superposed by chance. DEM L316 lies about 160,000 light years away in the neighboring Large Magellanic Cloud (LMC) galaxy, spans about 140 light-years across, and appears toward the southern constellation of the Swordfish (Dorado).

说明：这两个超新星遗迹相互间有关系吗？为了找出答案，位于智利山顶上的８米双子望远镜指向了这个奇特，巨大而又具有双瓣的DEM L316。上面显示的影像，收获了大量重要的信息。仔细检查这张影像，同时查看钱德拉X射线天文台拍摄的数据来看两个超新星遗迹有什么不同。特别是，较小的遗迹好像是Ⅰ类超新星爆发的结果（白矮星爆炸），而较大的那个遗迹好像是Ⅱ类超新星爆发的结果（一颗普通大质量恒星爆炸）。因为两颗恒星类型在不同时间段演变，所以它们应该不是同时形成，在物理空间上是没有联系。而且没有证据表明两个遗迹发生碰撞，它们只是碰巧在我们的视线方向上重叠。DEM L316位于距离我们大约16万光年远的大麦哲伦星系内，大小约140光年，位于南方星座剑鱼座内。

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星辰的遗迹，不朽的星辰也有凋零时，凋零背后，又是怎样的绚烂。

[ 本帖最后由 mant 于 2008-5-21 16:22 编辑 ]

mant[楼主]

Comet McNaught Over Chile
智利上空的麦克诺特彗星

Credit & Copyright: Stéphane Guisard
影像提供及版权：Stéphane Guisard

Explanation: Comet McNaught was perhaps the most photogenic comet of our time. After making quite a show in the northern hemisphere in early January, the comet moved south and developed a long and unusual dust tail that dazzled southern hemisphere observers. In this image, Comet McNaught was captured one year ago above Chile. The bright comet dominates on the left while part of its magnificent tail spreads across the entire picture. From this vantage point in the Andes Mountains, one looks up toward Comet McNaught and a magnificent sky, across at a crescent moon, and down on clouds, atmospheric haze, and the city lights of Santiago. Comet McNaught has glided into the outer Solar System and is now only visible as a speck in a large telescope. The other spectacular comet of 2007, Comet Holmes, has also faded from easy view.
说明：在我们这个时代，麦克诺特彗星可能是我们所见最上镜的彗星。今年一月初在北半球大放异彩后，该彗星运行到地球南方，形成了一条长而奇特的尘埃尾，让南半球的观测者们大饱眼福。上面这张影像，是一年前在智利拍摄的麦克诺特彗星。明亮的彗星占据了影像左侧部分，它那壮观的彗尾扫过了整张影像。站在安第斯山脉有利的地势上，一人朝向麦克诺特彗星就会看到一片壮观的天空中有一轮新月，在云层和大气层雾霾下就是圣地亚哥城市的灯光。麦克诺特彗星已经飞出我们太阳系，现在只能用专业的大型望远镜才能看到它。2007年其它壮观的彗星还有Holmes彗星，它也已从人们的视野里慢慢退去。

mcnaught_guisard.jpg (133.72 KB)

2008-5-21 16:12

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当永生的神的目光从众生的头顶掠过，人世的沧桑璀璨也许只是这周宇沧海的一粟。

[ 本帖最后由 mant 于 2008-5-21 16:24 编辑 ]

mant[楼主]

Thor's Emerald Helmet

雷神的翡翠头盔

Credit & Copyright: Robert Gendler
影像提供及版权：Robert Gendler

Explanation: This helmet-shaped cosmic cloud with wing-like appendages is popularly called Thor's Helmet. Heroically sized even for a Norse god, Thor's Helmet is about 30 light-years across. In fact, the helmet is actually more like an interstellar bubble, blown as a fast wind from the bright, massive star near the bubble's center sweeps through a surrounding molecular cloud. Known as a Wolf-Rayet star, the central star is an extremely hot giant thought to be in a brief, pre-supernova stage of evolution. Cataloged as NGC 2359, the nebula is located about 15,000 light-years away in the constellation Canis Major. The sharp image captures striking details of the nebula's filamentary structures and also records an almost emerald color from strong emission due to oxygen atoms in the glowing gas.
说明：这个带着羽翼，头盔形状的宇宙星云被称为雷神的头盔。该头盔大约30光年宽，对于北欧神话中的雷神来说已经很壮观了。事实上，这个头盔更像一个星际泡泡，从泡泡中央附近明亮，大质量恒星吹出了一道高速风，扫过了周围的分子云。这颗中央星被归类为沃夫-拉叶型恒星，是一颗极度炽热的巨星，正处在短暂且快速变化的前超新星演化阶段。这块被编录为NGC 2359的星云，位于大犬座内，距离我们大约有1.5万光年远。这张清晰的影像捕捉到了这个星云精彩的丝状结构，也记录了发光云气中由氧原子所发出的明亮翠绿色辐射。

xin_344f95bb721b407e83f3f304e9b28971_NGC2359_gendler_rc800.jpg (441.07 KB)

2008-5-21 16:14

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即将结束的星辰也如此耀眼，如挽歌在无边的回荡。

[ 本帖最后由 mant 于 2008-5-21 16:26 编辑 ]

mant[楼主]

Starry Night Castle
星夜城堡
Credit & Copyright: P-M Hedén
影像提供及版权：P-M Hedén

Explanation: The tantalizing Pleiades star cluster seems to lie just beyond the trees above a dark castle tower in this dramatic view of The World at Night. Recorded earlier this month, the starry sky also features bright star Aldebaran below the Pleiades and a small, faint, fuzzy cloud otherwise known as Comet Holmes near picture center at the top of the field. Starry Night Castle might be an appropriate name for the medieval castle ruin in the foreground. But its traditional name is Mörby Castle, found north of Stockholm, near lake Skedviken in Norrtälje, Sweden.
说明：在这张生动的夜晚影像中，心急的昴星团就位于黑暗城堡上方树木的外侧。这张影像拍摄于本月初，星空中还有明亮的毕宿五，就位于昴星团下方，影像中央上方附近小而昏暗模糊的点就是Holmes彗星。前景中的中世纪城堡应该被命为星夜城堡更为恰当。但它传统的名字为M?rby 城堡，位于瑞典首都斯德哥尔摩北部，Skedviken湖附近。

CastleHolmes_heden_c1.jpg (192.86 KB)

2008-5-21 16:32

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这让我想起了小时候院子里仰望星空，天空很晴朗，星星很多很亮，还有人造卫星缓缓的移动~

[ 本帖最后由 mant 于 2008-5-21 16:34 编辑 ]

九日少爷

好东西！我顶！！！真的很漂亮～～～想去宇宙啊～哪怕只看看地球呢