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[视图资料] Astronomy Picture of the Day-2009-每日天文一图第三季(updating)

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CDer:000024255
 楼主| 发表于 2009-07-23 18:12 | 显示全部楼层
2009 July 23

Jupiter's New Impact Scar
Credit & Copyright: Anthony Wesley
Explanation: In July of 1994 pieces of Comet Shoemaker-Levy 9 collided with planet Jupiter. The explosive impacts sent plumes of debris high into the Jovian atmosphere creating dark markings or scars, visible for a time against the cloud bands. Remarkably, 15 years later, another impact scar was discovered in the Jovian atmosphere by amateur astronomer Anthony Wesley as he examined images of the gas giant taken from his home observatory just outside Murrumbateman NSW Australia. Jupiter's south pole is at the top in this July 19 discovery image, with Jupiter rotating from right to left. The dark marking, also likely caused by a comet or asteroid impact, is near the top of the view, left of a pre-existing, whitish, oval-shaped storm. NASA's Infrared Telescope Facility images from Mauna Kea, Hawaii later confirmed the likely impact site's dark scar and plume of particles in Jupiter's upper atmosphere. Since 2006, major discovery observations by amateur astronomers have also included two red spots on Jupiter.
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 楼主| 发表于 2009-07-24 14:28 | 显示全部楼层
2009 July 24

Eclipse over Chongqing, China
Credit & Copyright: Stephan Heinsius
Explanation: The daytime sky grew dark, the temperature dropped, and lights came on as Chongqing, China, was plunged into the Moon's shadow during the July 22nd total solar eclipse. This serene, wide-angle view of the event looks to the east over the large, populous city from a newly constructed park. Despite thin clouds, it captures the shimmering solar corona just before the end of the eclipse total phase. This total solar eclipse occurred near Aphelion, the point in Earth's elliptical orbit farthest from the Sun, and so the Sun was near its smallest apparent size. It also occurred when the New Moon was near Perigee, the closest point to Earth in the Moon's elliptical orbit, making the Moon near its largest apparent size. The small Sun and large Moon made this the longest solar eclipse of this century.
说明:在722日全食期间,重庆慢慢地进入了月球的阴影,白昼慢慢变黑,温度下降,路灯被点亮。这张利用广角镜头拍摄的影像是在一个新建的公园里拍摄。尽管天空中有薄云,但是在全食阶段快结束前还是拍摄到了闪闪发光的日冕。此次日全食发生在远日点附近,也就是在地球椭圆轨道上距离太阳最远的那点上,因此地球上看到太阳的大小处于它最小的相位上。而发生日食时新月正好位于近地点,也就是月球椭圆轨道上距离地球最近的点,这使得看上去月球的相位最大。小太阳加上大月球使得此次日全食成为本世纪时间最长的日全食
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 楼主| 发表于 2009-07-25 16:46 | 显示全部楼层
2009 July 25

The Eagle Rises
Credit: Apollo 11, NASA - Stereo Image Copyright: John Kaufmann (ALSJ)
Explanation: Get out your red/blue glasses and check out this remarkable stereo view from lunar orbit. Created from two photographs (AS11-44-6633, AS11-44-6634) taken by astronaut Michael Collins forty years ago during the 1969 Apollo 11 mission, the 3D anaglyph features the lunar module ascent stage, dubbed The Eagle, as it rises to meet the command module in lunar orbit. Aboard the ascent stage are Neil Armstrong and Buzz Aldrin, the first to walk on the Moon. The smooth, dark area on the lunar surface is Mare Smythii located just below the equator on the extreme eastern edge of the Moon's near side. Poised beyond the lunar horizon, is our fair planet Earth.
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 楼主| 发表于 2009-07-26 16:34 | 显示全部楼层
2009 July 26

The Big Corona
Credit & Copyright: Koen van Gorp
Explanation: Most photographs don't adequately portray the magnificence of the Sun's corona. Seeing the corona first-hand during a total solar eclipse is best. The human eye can adapt to see features and extent that photographic film usually cannot. Welcome, however, to the digital age. The above picture is a combination of thirty-three photographs that were digitally processed to highlight faint features of a total eclipse that occurred in March of 2006. The images of the Sun's corona were digitally altered to enhance dim, outlying waves and filaments. Shadow seekers need not fret, though, since as yet there is no way that digital image processing can mimic the fun involved in experiencing a total solar eclipse. Last week, a spectacular total solar eclipse occurred over southern Asia, while the The next total solar eclipse will be visible from the South Pacific on 2010 July 11.
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 楼主| 发表于 2009-07-27 18:06 | 显示全部楼层
2009 July 27

NGC 1097: Spiral Galaxy with a Central Eye
Credit: NASA, JPL-Caltech, SINGS Team (SSC)
Explanation: What's happening at the center of spiral galaxy NGC 1097? No one is sure, but it likely involves a supermassive black hole. Matter falling in from a bar of stars and gas across the center is likely being heated by an extremely energetic region surrounding the central black hole. From afar, the entire central region appears in the above false-color infrared image as a mysterious eye. Near the left edge and seen in blue, a smaller companion galaxy is wrapped in the spectacular spiral arms of the large spiral, lit in pink by glowing dust. Currently about 40 thousand light-years from the larger galaxy's center, the gravity of the companion galaxy appears to be reshaping the larger galaxy as it is slowly being destroyed itself. NGC 1097 is located about 50 million light years away toward the constellation of the furnace (Fornax).
说明:旋涡星系NGC1097的中心正在发生什么?没人知道,但是这可能与质量超大的黑洞有关。星系中央附近的恒星和气体发生物质坍塌之后被围绕在中央黑洞周围的极高能区域加热。从远处看,上面这张红外假色影像里的中央区域看上去就像一只神秘的眼睛。在影像左边缘,可以看到一个较小的蓝色伴星系,包围在大旋涡星系壮观的旋臂上,闪耀在炽热尘埃发出的粉色辉光中。现今伴星系距离大星系中心约4光年远,其引力作用将再一次改变大星系结构,并且小星系本身也将被慢慢摧毁。NGC1907位于天炉座内,距离我们大约5,000万光年远。
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发表于 2009-07-28 10:44 | 显示全部楼层
只有惊叹 谢谢
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 楼主| 发表于 2009-07-28 17:06 | 显示全部楼层
2009 July 28

A Floral Aurora Corona
Credit & Copyright: [email=%20infocusimagery%20at%20telus.net]Zoltan Kenwell[/email] (Infocus Imagery)
Explanation: Few auroras show this level of detail. Above, a standard digital camera captured a particularly active and colorful auroral corona that occurred last week above Alberta, Canada. With a shape reminiscent of a flower, the spectacular aurora had an unusually high degree of detail. The vivid green and purple auroral colors are caused by high atmospheric oxygen and hydrogen reacting to a burst of incoming electrons. Many photogenic auroras have been triggered from a solar wind stream that recently passed the Earth. The auroras were unexpected because the initiating Sun has been unusually quiet of late.
说明:很少有极光能达到如此清晰的程度。上面的影像是用一台高级数码相机拍摄,捕捉到了上周发生在加拿大阿尔伯塔上空出现的特殊景象异常活跃而又色彩缤纷的极光冕。就像一朵一样,壮观的极光异常清晰极光颜色鲜明,绿色和紫色是因为高空大气层内原子和原子与进入大气层的电子暴接触后发生反应引起。许多上镜的极光都是因为太阳风最近通过地球而引发的。极光的出现难以预计,因为最近太阳异常平静
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 楼主| 发表于 2009-07-29 19:59 | 显示全部楼层
2009 July 29

The Milky Way Over Devil's Tower
Credit & Copyright: Wally Pacholka (TWAN)
Explanation: Was Devil's Tower once an explosive volcano? Famous for its appearance in films such as Close Encounters, the origin of Devil's Tower in Wyoming, USA is still debated, with a leading hypothesis holding that it is a hardened lava plume that probably never reached the surface to become a volcano. The lighter rock that once surrounded the dense volcanic neck has now eroded away, leaving the dramatic tower. High above, the central band of the Milky Way galaxy arches across the sky. Many notable sky objects are visible, including dark strands of the Pipe Nebula and the reddish Lagoon Nebula to the tower's right. Green grass and trees line the foreground, while moon-illuminated clouds appear near the horizon to the tower's left. Unlike many other international landmarks, mountaineers are permitted to climb Devil's Tower.
说明:魔鬼塔是否曾经是一座爆发的火山呢?魔鬼塔在诸如第三类接触中出现而闻名,位于美国怀俄明州,其起源仍处于争议之中,一种主要的假说认为它是一道硬化了的熔岩柱,因此不可能到达地表形成一座火山。颜色较浅的岩石曾经围绕在密度较大的火山状脖子周围,如今早已被侵蚀,而留下了这栩栩如生的高塔。影像上方就是银河系中心带,优美地蜿蜒划过天空。影像中可以看到许多显眼的天体,包括高塔右侧黑暗的烟斗星云以及泛红色的礁湖星云。绿草和树木位于前景中,而月光照亮的云朵接近高塔左侧的地平线。和许多其它国际地标不一样,魔鬼塔允许登山者攀登。
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 楼主| 发表于 2009-07-30 19:11 | 显示全部楼层
本帖最后由 jadiyd 于 2009-7-31 13:15 编辑

2009 July 30

6 Minutes 42 Seconds
Credit & Copyright: Babak Tafreshi (TWAN)
Explanation: The July 22nd total solar eclipse was the longest of the 21st century. From the point of maximum eclipse along the Moon's shadow track across the Pacific Ocean, the Moon completely blocked the Sun for a total of 6 minutes and 39 seconds. But from the deck of this cruise ship the duration of the total eclipse phase was extended to a whopping 6 minutes and 42 seconds by the ship's motion along the shadow track. This panoramic view of the scene shows the shimmering solar corona in a darkened daytime sky, with clouds silhouetted by a bright sky on the distant horizon, beyond the Moon's shadow. Mercury can be seen near the eclipsed Sun. Venus lies near the upper right edge of the frame.
说明:722日全食是21世纪时间最长的日全食。沿着月球的阴影轨迹穿过太平洋,月球完全挡住太阳的最大时间为639秒。但是在这艘巡洋舰的甲板上可以将日全食全食阶段的时间延长到642秒,只要船只沿着阴影的轨迹航行。这张全景影像显示的是白天天空中出现的闪闪发光的日冕,以及远处地平线上明亮天空中的云朵轮廓,处于月球的阴影之外。在全食阶段太阳的附近能看到水星。金星位于影像的右上方边缘附近。
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 楼主| 发表于 2009-07-31 13:15 | 显示全部楼层
本帖最后由 jadiyd 于 2009-8-1 19:39 编辑

2009 July 31

Hubble View: Jupiter Impact
Credit: NASA, ESA, H. Hammel (Space Science Institute, Boulder, Co.), and the Jupiter Impact Team
Explanation: This sprawling dark marking is Jupiter's latest impact scar, a debris plume created as a small asteroid or comet disintegrated after plunging into the gas giant's atmosphere. Located in Jupiter's south polar region, the new feature was discovered by Australian amateur astronomer Anthony Wesley on July 19. On July 23rd Wesley's discovery was followed up by the Hubble Space Telescope with its newly installed Wide Field Camera 3, creating this sharpest view of the evolving debris plume. Estimates indicate that the impacting object itself was several hundred meters across. Similar impact markings were created when pieces of Comet Shoemaker-Levy 9 slammed into Jupiter's cloud bands in July of 1994.
说明:这个巨大的黑色标记是木星最新的撞击伤疤,当一颗小新星或者彗星在进入气态巨行星的大气层之后开始分解,从而形成了碎片羽状烟柱。这一新形成的特征位于木星南极附近,由澳大利亚业余天文学家安东尼.韦斯利在719发现。723,韦斯利的发现被新安装在哈勃太空望远镜上的第三代广域照相机跟踪到,并对演变中的碎片烟柱拍摄了迄今最清晰的影像。据估计碰撞的天体本身有数百米宽。19947月当苏梅克-列维九号彗星猛烈撞击木星云带时也形成了类似的撞击痕迹
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 楼主| 发表于 2009-08-01 19:39 | 显示全部楼层
2009 August 1

SN 1006 Supernova Remnant
Image Credit: NASA, ESA, Zolt Levay (STScI)
Explanation: A new star, likely the brightest supernova in recorded human history, lit up planet Earth's sky in the year 1006 AD. The expanding debris cloud from the stellar explosion, found in the southerly constellation of Lupus, still puts on a cosmic light show across the electromagnetic spectrum. In fact, this composite view includes X-ray data in blue from the Chandra Observatory, optical data in yellowish hues, and radio image data in red. Now known as the SN 1006 supernova remnant, the debris cloud appears to be about 60 light-years across and is understood to represent the remains of a white dwarf star. Part of a binary star system, the compact white dwarf gradually captured material from its companion star. The buildup in mass finally triggered a thermonuclear explosion that destroyed the dwarf star. Because the distance to the supernova remnant is about 7,000 light-years, that explosion actually happened 7,000 years before the light reached Earth in 1006. Shockwaves in the remnant accelerate particles to extreme energies and are thought to be a source of the mysterious cosmic rays.
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 楼主| 发表于 2009-08-02 12:44 | 显示全部楼层
2009 August 2

Stars, Dust and Nebula in NGC 6559
Credit & Copyright: Adam Block, Mt. Lemmon SkyCenter, U. Arizona
Explanation: When stars form, pandemonium reigns. A textbook case is the star forming region NGC 6559. Visible above are red glowing emission nebulas of hydrogen, blue reflection nebulas of dust, dark absorption nebulas of dust, and the stars that formed from them. The first massive stars formed from the dense gas will emit energetic light and winds that erode, fragment, and sculpt their birthplace. And then they explode. The resulting morass can be as beautiful as it is complex. After tens of millions of years, the dust boils away, the gas gets swept away, and all that is left is a naked open cluster of stars.
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 楼主| 发表于 2009-08-03 14:51 | 显示全部楼层
2009 August 3

T Tauri: A Star is Formed
Credit & Copyright: T. Rector (U. Alaska Anchorage), H. Schweiker, WIYN, NOAO, AURA, NSF
Explanation: What does a star look like when it is forming? The prototypical example is the variable star T Tauri, visible as the bright orange star near the image center. The orange star centered in this remarkable telescopic skyview is T Tauri, prototype of the class of T Tauri variable stars. Surrounding T Tauri is a dusty yellow cosmic cloud named the Hind's Variable Nebula (NGC 1555/1554). Over 400 light-years away, at the edge of a molecular cloud, both star and nebula are seen to vary significantly in brightness but not necessarily at the same time, adding to the mystery of the intriguing region. T Tauri stars are now generally recognized as young -- less than a few million years old -- sun-like stars still in the early stages of formation. To further complicate the picture, infrared observations indicate that T Tauri itself is part of a multiple star system. Surprisingly, due to a close gravitational pass near one of these stars, T Tauri may now be headed out of the system. The dramatic color image above captures a region that spans about 4 light-years.
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 楼主| 发表于 2009-08-04 19:43 | 显示全部楼层
2009 August 4

A Triple Sunrise Over Gdansk Bay
Credit & Copyright: [email=%20diaconb%20at%20mcmaster%20dot%20ca]Barry[/email] & Noemi Diacon (McMaster U.)
Explanation: How can the same Sun rise three times? Last month on Friday, 2009 July 10, a spectacular triple sunrise was photographed at about 4:30 am over Gdansk Bay in Gdansk, Poland. Clearly, our Sun rises only once. Some optical effect is creating at least two mirages of the Sun -- but which effect? In the vast majority of similarly reported cases, mirages of the brightest object in the frame can be traced to reflections internal to the camera taking the images. Still, the above image is intriguing because a sincere photographer claims the effect was visible to the unaided eye, and because the photographer took several other frames that show variants of the same effect. Therefore, polite readers are invited to debate whether the above image captures a particularly spectacular example of common reflections inside a standard digital camera, shows one of the most spectacular examples of atmospheric lensing yet recorded, or was caused by something completely different. If the discussion converges, the consensus will be posted here at a later date.
说明:同样的太阳如何能够升起三次呢?2009710,也就是上个月的一个周五,大约在430分左右,一次壮观的日出三重奏出现在波兰格但斯克湾的上空。很明显,我们的太阳每天只能升起一次。一些光学效应形成了至少两个太阳幻象,但是什么在起作用?在大多数类似报道的情况中,最明亮物体的幻象可以被拍摄影像的相机内部反射而得到。因此,上面的影像如此迷人,因为诚实的摄影师声明这个效应肉眼可见,因为摄影师拍摄了另外数张影像,也显示了相同的效应。因此,睿智的读者被邀请来讨论是什么造成了在一张标准的数码影像内,具有如此壮观的共反射,显示了迄今记录下最为壮观的大气透镜现象,抑或是由一些完全不同的事物造成。如果讨论有了结果,那么在不久的将来我们会把结果公布在这里。
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 楼主| 发表于 2009-08-05 13:19 | 显示全部楼层
2009 August 5

Betelgeuse Resolved
Credit: NaCo, VLT, ESO
Explanation: The sharpest image ever of Betelgeuse shows a mammoth star that is slowly evaporating. Betelgeuse (sounds a lot like "beetle juice"), also known as Alpha Orionis, is one of the largest and brightest stars known. The star is a familiar orange fixture easily visible to the unaided eye toward the constellation of Orion. The above recent image from the Very Large Telescope in Chile resolves not only the face of Betelgeuse, but a large and previously unknown plume of surrounding gas. This plume gives fresh indications of how the massive star is shedding mass as it nears the end of its life. Conversely, a series of previous observations indicate that the surface of Betelgeuse has noticeably shrunk, on the average, over the past decade. If Betelgeuse, a red supergiant star about 640 light years distant, were placed at the center of our Solar System, the plume would extend past the orbit of Jupiter. Since Betelgeuse is known to change its brightness irregularly, future observations may determine if changes its appearance irregularly as well. Betelgeuse is a candidate to undergo a spectacular supernova explosion almost anytime in the next few thousand years.
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 楼主| 发表于 2009-08-07 12:43 | 显示全部楼层
2009 年 08 月 06 日


飞马座内的星系
影像提供及版权:Dietmar Hager


说明:这张清晰的广域影像揭示了飞马座北部边界恒星外分布的星系。其中最显著的就是影像右上方的NGC7331。这个巨大的旋涡星系距离我们仅仅5,000万光年远,是较为明亮的星系之一,但并不包含在18世界著名的查尔斯梅西耶星云星团表内。而影像左下方的星系团看上去较为混乱,被称为斯蒂芬五重星系,距离我们大约3亿光年远,五重星系戏生动地演示了一次多星系间发生碰撞的情形,它们正在进行中的剧烈相互作用成为这张宇宙快照中的风景。在天空中,五重奏和NGC7331相距大约半度。
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 楼主| 发表于 2009-08-07 12:44 | 显示全部楼层
本帖最后由 jadiyd 于 2009-8-8 14:50 编辑

2009 August 7

The Star Clusters of NGC 1313
Credit: NASA, ESA, Anne Pellerin (STScI)
Explanation: Like grains of sand on a cosmic beach, individual stars of barred spiral galaxy NGC 1313 are resolved in this sharp composite from the Hubble Space Telescope's Advanced Camera for Surveys (ACS). The inner region of the galaxy is pictured, spanning about 10,000 light-years. Hubble's unique ability to distinguish individual stars in the 14 million light-year distant galaxy has been used to unravel the fate of star clusters whose bright young stars are spread through the disk of the galaxy as the clusters dissolve. The exploration of stars and clusters in external galaxy NGC 1313 offers clues to star formation and star cluster evolution in our own Milky Way.
说明:由哈勃太空望远镜增强型观测照相机(ACS)拍摄了这张清晰的合成影像,棒旋星系NGC1313内的恒星就像是宇宙沙滩上的沙粒一样。星系的内部区域就出现在上面的影像中,其中大约覆盖1万光年。哈勃能够辨别远在1,400万光年外星系内的单颗恒星,这种特殊能力已经被用来揭开恒星团的命运,当星团解散之后,星团内的年轻恒星就会散步在星系的盘面上。对河外星系NGC1313内恒星和星团的探索为研究我们银河系恒星进化和恒星团的演变提供了线索。
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 楼主| 发表于 2009-08-08 14:51 | 显示全部楼层
2009 August 8

Diamonds in a Cloudy Sky
Credit & Copyright: Óscar Martín Mesonero (OSAE), SAROS Group
Explanation: Cloudy skies over Wuhan, China hid the delicate solar corona during July's total eclipse of the Sun. Still, the Moon's silhouette was highlighted by these glistening diamonds as the total eclipse phase ended. Caused by bright sunlight streaming through dips and valleys in the irregular terrain along the Moon's edge, the effect is known as Baily's Beads, named after Francis Baily who called attention to the phenomenon in 1836. The dramatic appearance of the beads at the beginning or end of a total solar eclipse is also known as the Diamond Ring effect. In this remarkable image, a small, pinkish solar prominence can also be seen along the edge, below the diamonds.
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 楼主| 发表于 2009-08-09 12:55 | 显示全部楼层
2009 August 9

Saturn's Iapetus: Painted Moon
Credit: Cassini Imaging Team, SSI, JPL, ESA, NASA
Explanation: What has happened to Saturn's moon Iapetus? Vast sections of this strange world are dark as coal, while others are as bright as ice. The composition of the dark material is unknown, but infrared spectra indicate that it possibly contains some dark form of carbon. Iapetus also has an unusual equatorial ridge that makes it appear like a walnut. To help better understand this seemingly painted moon, NASA directed the robotic Cassini spacecraft orbiting Saturn to swoop within 2,000 kilometers in 2007. Pictured above, from about 75,000 kilometers out, Cassini's trajectory allowed unprecedented imaging of the hemisphere of Iapetus that is always trailing. A huge impact crater seen in the south spans a tremendous 450 kilometers and appears superposed on an older crater of similar size. The dark material is seen increasingly coating the easternmost part of Iapetus, darkening craters and highlands alike. Close inspection indicates that the dark coating typically faces the moon's equator and is less than a meter thick. A leading hypothesis is that the dark material is mostly dirt leftover when relatively warm but dirty ice sublimates. An initial coating of dark material may have been effectively painted on by the accretion of meteor-liberated debris from other moons. This and other images from Cassini's Iapetus flyby are being studied for even greater clues.
最具影响力军事论坛-超级大本营军事论坛欢迎你!超然物外,有容乃大。
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 楼主| 发表于 2009-08-10 14:09 | 显示全部楼层
本帖最后由 jadiyd 于 2009-8-13 13:05 编辑

2009 August 10
今天不是天文图,是视频
由于来自YOUTUBE
我给出源连接
http://antwrp.gsfc.nasa.gov/apod/astropix.html
劳烦诸位自己翻墙去看了~
2009 August 10

Moonbow and Rainbows Over Patagonia
Credit & Copyright: Stéphane Guisard (Los Cielos de Chile)
Explanation: Have you ever seen a moonbow? Just as rainbows are lit by the Sun, moonbows are lit by the Moon. Since the Sun is so much brighter than the Moon, sunlit rainbows are much brighter and more commonly seen than moonbows. The above movie captures not only a moonbow, but several rainbows, moving clouds, and the starry sky visible in 2009 February over Patagonia in Chile. The slight movement of the rainbows is due to the changing sky position of the Sun. Since moonlight is itself reflected sunlight, the colors are nearly the same. Both rainbows and moonbows are created by light being scattered inside small water droplets, typically from a nearby rainfall. The raindrops each act as miniature prisms, together creating the picturesque spectrum of colors seen.
最具影响力军事论坛-超级大本营军事论坛欢迎你!超然物外,有容乃大。
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 楼主| 发表于 2009-08-12 16:38 | 显示全部楼层
2009 年 08 月 11 日

巴林杰陨石坑的内部
影像提供及版权:Tony Rowell
说明:当一颗流星击中地面会发生什么情况?通常不会有什么发生,因为大多数流星都较小,而且对地面只能造成很小的洞,它们很快就会被侵蚀掉。然而在大约5万年前,一颗巨大的流星造成了美国亚利桑那州巴林杰陨石坑。形成陨石坑的直径大约1公里多。上面的影像是一个旅游团在今年早些时候参观巴林杰内部。1920年,巴林杰陨石坑就被认定为由陨石撞击而成。今天在地球地面上发现了超过100多个碰撞坑计算机模拟数据表明在撞击形成巴林杰陨石坑的期间,有些Canyon Diablo撞击物质已经熔化。
最具影响力军事论坛-超级大本营军事论坛欢迎你!超然物外,有容乃大。
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 楼主| 发表于 2009-08-12 16:39 | 显示全部楼层
本帖最后由 jadiyd 于 2009-8-13 13:04 编辑

2009 August 12

今天的图十分大...
1.38M
为了诸位的浏览速度
我就不贴出来了
地址如下
http://antwrp.gsfc.nasa.gov/apod/image/0908/NGC55Web4_goldman.jpg
想看的直接下载就好
-----------------------------------
更新北京天文馆的裁剪版~

Irregular Galaxy NGC 55
Credit & Copyright: Don Goldman
Explanation: Irregular galaxy NGC 55 is thought to be similar to the Large Magellanic Cloud (LMC). But while the LMC is about 180,000 light-years away and is a well known satellite of our own Milky Way Galaxy, NGC 55 is more like 6 million light-years distant and is a member of the Sculptor Galaxy Group. Classified as an irregular galaxy, in deep exposures the LMC itself resembles a barred disk galaxy. However, spanning about 50,000 light-years, NGC 55 is seen nearly edge-on, presenting a flattened, narrow profile in contrast with our face-on view of the LMC. Just as large star forming regions create emission nebulae in the LMC, NGC 55 is also seen to be producing new stars. This higly detailed galaxy portrait highlights a bright core crossed with dust clouds, telltale pinkish star forming regions, and young blue star clusters in NGC 55.
说明:不规则星系NGC55被认为结构与大麦哲伦星系(LMC)类似。但是大麦哲伦星系距离我们大约18万光年远,是我们银河系的一个卫星星系,而NGC55距离们约600万光年,是玉夫星系团的一员。大麦哲伦星系也被归类为不规则星系,在深空影像中类似一个棒状圆盘星系。而NGC55大约覆盖了5万光年,从侧面看去,扁平狭窄的外观与大麦哲伦星系正面外观形成鲜明的对比。就像大麦哲伦星系内的巨大恒星形成区域形成了发射星云一样,可以看到NGC55内也正在新诞生恒星。这张高清晰星系影像突出了尘埃星云中的明亮星核,显而易见的粉色恒星形成区域,以及年轻的蓝色恒星团。

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最具影响力军事论坛-超级大本营军事论坛欢迎你!超然物外,有容乃大。
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 楼主| 发表于 2009-08-13 13:04 | 显示全部楼层
本帖最后由 jadiyd 于 2009-8-14 20:46 编辑

2009 August 13

Block Island Meteorite on Mars
Credit: Mars Exploration Rover Mission, JPL, NASA
Explanation: What is this strange rock on Mars? Sitting on a smooth plane, the rock stands out for its isolation, odd shape, large size and unusual texture. The rock was discovered by the robotic Opportunity rover rolling across Mars late last month. Pictured above, Opportunity prepares to inspect the unusual rock. After being X-rayed, poked, and chemically analyzed, the rock has now been identified by Opportunity as a fallen meteorite. Now dubbed Block Island, the meteorite has been measured to be about 2/3 of a meter across and is now known to be composed mostly of nickel and iron. This is the second meteorite found by a martian rover, and so far the largest. Vast smooth spaces on Mars and Earth can make large meteorites stand out. Opportunity continues its trip across Meridiani Planum on Mars and is on schedule to reach expansive Endeavor Crater next year.
说明:火星上这块奇怪的石头是什么?石头位于平滑的地面上,孤独地躺在那里,形状奇特,块大而且质地非同寻常。这块石头是由上个月末,机遇号探测器穿越火星表面时发现。在上面影像里,机遇号正准备检测这块石头。在经过X射线,触碰以及化学分析后,机遇号探测器确定这块岩石就是飞落下来的陨石。该陨石被称为石块岛,经测量该陨石大约有2/3米宽,大部分由镍和铁构成。这是火星探测器发现的第二颗陨石,也是最大的一颗。火星和地球上巨大的空地很容易让陨石凸显出来。机遇号继续着自己穿越子午圈平面之旅,预计将在明年达到Endeavor陨石坑
最具影响力军事论坛-超级大本营军事论坛欢迎你!超然物外,有容乃大。
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 楼主| 发表于 2009-08-14 20:45 | 显示全部楼层
2009 August 14

Shuttle and Meteor
Credit & Copyright: Stephen Clark / Spaceflightnow.com
Explanation: This early morning skyscape was captured last week on August 4th, looking northeast across calm waters in the Turn Basin at NASA's Kennedy Space Center. In a striking contrast in motion, the space shuttle Discovery, mounted on a massive transporter, creeps toward launch pad 39A at less than two miles per hour, while a brilliant meteor streaks through the sky traveling many miles per second. Of course, this week skywatchers have seen many similar meteor streaks during the annual Perseid meteor shower. But the meteor flashing above Discovery is not likely to be one of the Perseids because its path doesn't point back to that shower's radiant. Seen here near picture center, brilliant planet Venus still dominates the sky as the Morning Star, though. Yellowish tinted Mars lies near the top of the frame and Orion's red giant star Betelgeuse is toward the right.
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 楼主| 发表于 2009-08-15 12:30 | 显示全部楼层
2009 August 15

Meteor by Moonlight
Credit & Copyright: Babak Tafreshi (TWAN)
Explanation: Dark skies are favored for viewing meteor showers. But the annual Perseid Meteor Shower still entertained skygazers around the world this week even though the Moon brightened the night. At its last quarter phase and rising around midnight on August 13, after the shower's anticipated peak, the Moon is seen here above rock formations in the Alborz Mountains near Firouzkooh, Iran. With a dramatic desert landscape in the foreground, a Perseid meteor is streaking through the moonlit sky between the overexposed Moon and bright planet Jupiter at the upper right. A regular celestial event in the northern hemisphere, the Perseid Meteor Shower is caused by planet Earth's yearly passage through the dust stream cast off by comet Swift-Tuttle.
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 楼主| 发表于 2009-08-16 18:37 | 显示全部楼层
2009 August 16

A Laser Strike at the Galactic Center
Credit: [email=ybialets%20at%20eso.org]Yuri Beletsky[/email] (ESO)
Explanation: Why are these people shooting a powerful laser into the center of our Galaxy? Fortunately, this is not meant to be the first step in a Galactic war. Rather, astronomers at the Very Large Telescope (VLT) site in Chile are trying to measure the distortions of Earth's ever changing atmosphere. Constant imaging of high-altitude atoms excited by the laser -- which appear like an artificial star -- allow astronomers to instantly measure atmospheric blurring. This information is fed back to a VLT telescope mirror which is then slightly deformed to minimize this blurring. In this case, a VLT was observing our Galaxy's center, and so Earth's atmospheric blurring in that direction was needed. As for inter-galaxy warfare, when viewed from our Galaxy's center, no casualties are expected. In fact, the light from this powerful laser would combine with light from our Sun to together appear only as bright as a faint and distant star.
最具影响力军事论坛-超级大本营军事论坛欢迎你!超然物外,有容乃大。
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 楼主| 发表于 2009-08-17 12:18 | 显示全部楼层
本帖最后由 jadiyd 于 2009-8-18 12:44 编辑

2009 August 17

Perseids from Perseus
Credit & Copyright: Chris Peterson (Cloudbait Observatory)
Explanation: Where are all of these meteors coming from? In terms of direction on the sky, the pointed answer is the constellation of Perseus. That is why the last week's meteor shower was known as the Perseids -- the meteors all appear to come from a radiant toward Perseus. Three dimensionally, however, sand-sized debris expelled from Comet Swift-Tuttle follows a well-defined orbit about our Sun, and the part of the orbit that approaches Earth is superposed in front of the Perseus. Therefore, when Earth crosses this orbit, the radiant point of falling debris appears in Perseus. Pictured above, a composite image of this year's Pereids meteor shower shows many bright meteors that streaked through the sky on August 12. To the surprise of many, the next night, August 13, also showed many meteors, as demonstrated by rolling one's cursor over the above image. This year's Leonids meteor shower in November is expected by some to be exceptionally active, perhaps producing as many as 500 meteors per hour.
说明:这些流星都是从哪里来的?按照天空中的方位,那里正是英仙座的方向。这就是为什么上周发生的流星雨被称为英仙座流星雨的原因,所有的流星看上去都来自英仙座的辐射点。然而就三维立体来看,从斯威夫特-塔特尔彗星喷出来的沙粒状碎片沿着预定的轨道绕太阳运行,轨道的一部分正好靠近地球,并且与英仙座方位恰好重叠。因此,当地球靠近这段轨道时,从辐射点落下的碎片就形成了英仙座流星雨。上面的影像是今年英仙座流星雨的合成影像,其中显示了在812,有许多明亮的流星划过夜空。令人惊奇的是在第二晚,813还有许多流星出现,将你的鼠标放在影像上面就会出现新的场景。今年11月的狮子座流星雨可能会异常活跃,每小时可能会出现500颗。
最具影响力军事论坛-超级大本营军事论坛欢迎你!超然物外,有容乃大。
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 楼主| 发表于 2009-08-18 12:44 | 显示全部楼层
2009 August 18

The Milky Way Over the Badlands
Credit & Copyright: Wally Pacholka (AstroPics.com, TWAN)
Explanation: Why take a picture of just the Badlands when you can take one that also shows the spectacular sky above it? Just such a picture, actually a digital stitched panorama of four images, was taken in late June near midnight, looking southwest. In the foreground, the unusual buttes of the Badlands Wall, part of the Badlands National Park in South Dakota, USA, were momentarily illuminated by flashlight during a long duration exposure of the background night sky. The mountain-like buttes visible are composed of soft rock that show sharp erosion features from wind and water. The South Dakota Badlands also contain ancient beds rich with easy-to-find fossils. Some fossils are over 25 million years old and hold clues to the evolutionary origins of the horse and the saber-toothed tiger. Bright Jupiter dominates the sky on the left just above the buttes, while the spectacular Milky Way Galaxy runs down the image right.
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 楼主| 发表于 2009-08-19 16:51 | 显示全部楼层
2009 August 19

IC 1396 and Surrounding Starfield
Credit & Copyright: Thomas W. Earle
Explanation: Sprawling across hundreds of light-years, emission nebula IC 1396, visible on the upper right, mixes glowing cosmic gas and dark dust clouds. Stars are forming in this area, only about 3,000 light-years from Earth. This wide angle view also captures surrounding emission and absorption nebula. The red glow in IC 1396 and across the image is created by cosmic hydrogen gas recapturing electrons knocked away by energetic starlight. The dark dust clouds are dense groups of smoke-like particles common in the disks of spiral galaxies. Among the intriguing dark shapes within IC 1396, the winding Elephant's Trunk nebula lies just right of the nebula's center. IC 1396 lies in the high and far off constellation of Cepheus.
说明:发射星云IC1396覆盖大约数百光年,在影像的右上方可以看到混杂着炽热的宇宙气体以及黑色尘埃云。在这片区域内的恒星距离地球只有3,000光年。这张广角影像还捕捉到了周围发射星云以及吸收星云IC1396以及贯穿影像的红光是由宇宙中的氢气产生,被高能星光电离了的氢原子重新捕捉到电子后引起。黑暗的尘埃云是旋涡星系盘面内普遍存在的浓密烟雾状微粒团。在IC1396迷人的黑暗形状内,缠绕的象鼻星云位于星云中央右侧。IC1396位于仙王座内。
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 楼主| 发表于 2009-08-20 16:28 | 显示全部楼层
2009 August 20

Eclipse City
Credit & Copyright: [email=%20hong08%20at%20gmail%20dot%20com]Alfred Lee[/email]
Explanation: During July 22nd's solar eclipse, the Moon's dark shadow traced a narrow path as it raced eastward across India and China and on into the Pacific. Hong Kong was south of the shadow's path, so a total eclipse was not visible there, but a partial eclipse was still enjoyed by inhabitants of the populous city. And while many were (safely!) watching the sky, images of the partially eclipsed Sun adorned the city itself. In this downlooking photo, taken at 9:40am local time, a remarkable array of solar eclipse views was created by reflection in a grid of eastward facing skyscraper windows. The photographer's location was the 27th floor of Two Pacific Place.
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 楼主| 发表于 2009-08-21 19:14 | 显示全部楼层
2009 August 21

The Whale and the Hockey Stick
Credit & Copyright: Josef Poepsel, Stefan Binnewies (Capella Observatory)
Explanation: NGC 4631 is a big beautiful spiral galaxy seen edge-on (top right) only 25 million light-years away towards the small northern constellation Canes Venatici. This galaxy's slightly distorted wedge shape suggests to some a cosmic herring and to others the popular moniker of The Whale Galaxy. Either way, it is similar in size to our own Milky Way. In this gorgeous color image, the Whale's dark interstellar dust clouds, yellowish core, and young blue star clusters are easy to spot. A companion galaxy, the small elliptical NGC 4627, appears above the Whale Galaxy. At the lower left is another distorted galaxy, the hockey stick-shaped NGC 4656. The distortions and mingling trails of gas detected at other wavelengths suggest that all three galaxies have had close encounters with each other in their past. The Whale Galaxy is also known to have spouted a halo of hot gas glowing in x-rays.
说明:NGC4631是一个巨大而又漂亮的旋涡星系,该星系侧面面对我们(影像右上方)距离我们2,500万光年远,位于猎犬座内。这个星系形状微微扭曲,看上去就像是一条宇宙中的青鱼,它还有一个更为有名的绰号鲸鱼星系。然而,它的大小与我们银河系大小相似。在这张绚丽的彩色影像里,鲸鱼内的黑色星际尘埃云,泛黄色星核以及年轻的蓝色星团都清晰可辨。可以看到椭圆星系NGC4627出现在鲸鱼星系上方,也是鲸鱼星系的伴星系。而影像左下角的是另一个被扭曲的星系,形状就像一个曲棍球棒,名NGC4656。在其它波段下检测可以看到云气扭曲而又混杂,这就说明所有这三个星系在过去都相互间近距离遭遇过。在X射线下,鲸鱼星系还有一个炽热气体发出的光晕。
最具影响力军事论坛-超级大本营军事论坛欢迎你!超然物外,有容乃大。
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 楼主| 发表于 2009-08-22 16:06 | 显示全部楼层
2009 August 22

The Gum Nebula
Credit & Copyright: Axel Mellinger
Explanation: Named for Australian astronomer Colin Stanley Gum (1924-1960), The Gum Nebula is so large and close it is actually hard to see. In fact, we are only about 450 light-years from the front edge and 1,500 light-years from the back edge of this cosmic cloud of glowing hydrogen gas. Covered in this 41 degree-wide mosaic of H-alpha images, the faint emission region is otherwise easy to lose against the background of Milky Way stars. The complex nebula is thought to be a supernova remnant over a million years old, sprawling across the southern constellations Vela and Puppis. Sliding your cursor over this spectacular wide field view will reveal the location of objects embedded in The Gum Nebula, including the Vela supernova remnant.
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 楼主| 发表于 2009-08-23 13:14 | 显示全部楼层
2009 August 23


Giant Cluster Bends, Breaks Images
Credit: NASA, ESA, H. Lee & H. Ford (Johns Hopkins U.)
Explanation: What are those strange blue objects? Many of the brightest blue images are of a single, unusual, beaded, blue, ring-like galaxy which just happens to line-up behind a giant cluster of galaxies. Cluster galaxies here typically appear yellow and -- together with the cluster's dark matter -- act as a gravitational lens. A gravitational lens can create several images of background galaxies, analogous to the many points of light one would see while looking through a wine glass at a distant street light. The distinctive shape of this background galaxy -- which is probably just forming -- has allowed astronomers to deduce that it has separate images at 4, 10, 11, and 12 o'clock, from the center of the cluster. A blue smudge near the cluster center is likely another image of the same background galaxy. In all, a recent analysis postulated that at least 33 images of 11 separate background galaxies are discernable. This spectacular photo of galaxy cluster CL0024+1654 from the Hubble Space Telescope was taken in November 2004.
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 楼主| 发表于 2009-08-24 16:14 | 显示全部楼层
2009 August 24

Morning Glory Clouds Over Australia
Credit & Licence: [email=%20mickpetroff%20at%20bipond%20dot%20com]Mick Petroff[/email]; Tip Thanks: James Holmes (Cairns)
Explanation: What causes these long, strange clouds? No one is sure. A rare type of cloud known as a Morning Glory cloud can stretch 1,000 kilometers long and occur at altitudes up to two kilometers high. Although similar roll clouds have been seen at specific places across the world, the ones over Burketown, Queensland Australia occur predictably every spring. Long, horizontal, circulating tubes of air might form when flowing, moist, cooling air encounters an [url=]inversion layer[/url], an atmospheric layer where air temperature atypically increases with height. These tubes and surrounding air could cause dangerous turbulence for airplanes when clear. Morning Glory clouds can reportedly achieve an airspeed of 60 kilometers per hour over a surface with little discernible wind. Pictured above, photographer Mick Petroff photographed some Morning Glory clouds from his airplane near the Gulf of Carpentaria, Australia.
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 楼主| 发表于 2009-08-25 16:46 | 显示全部楼层
2009 August 25

Equinox at Saturn
Credit: Cassini Imaging Team, ISS, JPL, ESA, NASA
Explanation: What would Saturn's rings look like if the ring plane pointed directly at the Sun? That situation occurred earlier this month when equinox occurred on Saturn. Since the Earth is nearly in the same direction as the Sun from Saturn, the rings appeared to disappear from Earth. From the robotic Cassini spacecraft orbiting Saturn, however, the unusually illuminated ring plane could be viewed from on high. Pictured above, Saturn's rings, darker than ever seen before, were captured just a few hours before equinox on 2009 August 10. The reason for the unusual brightness of an inner ring is currently unknown, but possibly related to particle sizes there being larger than the 10 meter average thickness of the rest of Saturn's rings. Short light streaks in the frame are artificial image artifacts and have nothing to do with Saturn's ring plane. Planetary scientists will be studying ring images taken near equinox to help better understand the dynamics and particle size distribution of the Solar System's most extensive ring system.
说明:当土星的光环盘面直接指向太阳时,土星光环看起来会是什么样子?这个情况就发生在本月的早些时候,那时土星正处于春分点上。因为从土星看来,地球跟太阳一样处于相同的方向上,因此从地球上看去土星的光环也是看不到的。而以绕土星飞行的卡西尼飞船的视野,被显著照亮了的光环盘面正好能从高空看到。上面的影像里,土星的光环比以往任何时候看到的都更加黑暗,而影像拍摄的时间仅仅在2009810春分点的前几个小时。而内道光环为何异常发亮的原因现在仍未知,但很可能与那里的微粒大小有关,该处的微粒大小比土星其余光环直径10的微粒平均厚度还大。而影像中的短光纹是人工影像造成,与土星光环盘面毫无关系。行星科学家们将会研究这张在昼夜平分线附近拍摄到的光环影像,用以帮助更好地理解太阳系内最为宽阔的光环系统内动力学以及微粒分布。
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 楼主| 发表于 2009-08-26 16:37 | 显示全部楼层
2009 August 26

Classic Orion Nebulae
Credit & Copyright: [email=%20vortmax_klh%20at%20yahoo%20dot%20ca]Kerry-Ann Lecky Hepburn[/email] (Weather and Sky Photography)
Explanation: The Great Nebula in Orion, also known as M42, is one of the most famous nebulae in the sky. The star forming region's glowing gas clouds and hot young stars are near the center of this colorful deep sky image that includes the smaller nebula M43 and dusty, bluish reflection nebulae NGC 1977 and friends on the left. Located at the edge of an otherwise invisible giant molecular cloud complex, these eye-catching nebulae represent only a small fraction of this galactic neighborhood's wealth of interstellar material. Captured with very modest equipment, the gorgeous skyscape was awarded Best in Show at the 2009 Starfest International Salon of Astrophotography. Judges commented that the detail and shading were exquisite in this version of a classic astronomical image. The field spans nearly 3 degrees or about 75 light-years at the Orion Nebula's estimated distance of 1,500 light-years.
说明猎户座大星云也被称为M42,是天空中最为著名的星云之一。在这张彩色的深空影像中央附近出现的是恒星形成区域内发出的炽热氢气云以及影像左侧出现的年轻的恒星,其中包括较小的星云M43,尘埃状的反射星云NGC1977以及其伙伴。这些吸引眼球的星云位于不可见超大分子云的边缘,星云只是这个巨大星际物质的一小部分。这张影像仅仅用最普通的设备拍摄,并被授予2009国际天体摄影沙龙展中最出色的作品。评审对这张经典的天文影像的评语是影像的细节和阴影都非常优美。这张影像覆盖近3度天气,在猎户座星云大约1,500光年的距离上估计,该区域涵盖大约有75光年。
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 楼主| 发表于 2009-08-27 12:16 | 显示全部楼层
本帖最后由 jadiyd 于 2009-8-28 13:41 编辑

2009 August 27

A Dark Sky Over Sequoia National Park
Credit: D. Duriscoe, C. Duriscoe, R. Pilewski, & L. Pilewski, U.S. NPS Night Sky Program
Explanation: Scroll right to take in the view from the highest summit in the contiguous USA. The above 360-degree digitally stitched panorama, taken in mid-July, shows the view from 4,400-meter high Mt. Whitney in Sequoia National Park, California. In the foreground, angular boulders populate Mt. Whitney's summit while in the distance, just below the horizon, peaks from the Sierra Nevada mountain range are visible. Sky sights include light pollution emanating from Los Angeles and Fresno, visible just above the horizon. Dark clouds, particularly evident on the image left well above the horizon, are the remnants of a recent thunderstorm near Death Valley. High above, the band of the Milky Way Galaxy arches across the image left. Bright airglow bands are visible all over the sky but are particularly prominent on the image right. The planet Jupiter appears as the brightest point on the image left. A discerning eye can also find a faint image of the far distant Andromeda galaxy, a satellite trail, and many constellations. Today marks the 100th anniversary of the completion of the historic stone shelter on Mt. Whitney, visible toward the image right.
说明:向右拖动滚动条,你将欣赏到毗邻美国最高峰所看到的美景。这张360度数码全景拼接影像,拍摄于7月中旬,是从加利福尼亚州红杉国家公园4,400高的惠特尼山峰拍摄。前景是散落在惠特尼峰顶的岩石,而远处位于地平线下方的是内华达山脉。天空中的景色包括紧贴着地平面,由洛杉矶费雷斯诺发出的都市光害,影像左侧地平面上方的乌云,是不久之前死亡峡谷所留下的残云,更上方则可见到蜿蜒在影像左侧的银河盘面。影像里到处都可以见到带状的明亮大气辉光,而影像右端最为突出。影像左侧最亮的天体是木星。敏锐的观测者还可以找到遥远仙女座大星系的黯淡光晕、一道人造卫星的轨迹和众多的星座。今天是惠特尼山顶紧急避难石屋建成一百周年,在影像右侧可见到这座历史性的建物。
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 楼主| 发表于 2009-08-28 13:41 | 显示全部楼层
本帖最后由 jadiyd 于 2009-8-29 14:31 编辑

2009 August 28

NGC 7822 in Cepheus
Credit & Copyright: Don Goldman
Explanation: Pillars of gas, dust, and young, hot stars fill the center of NGC 7822. At the edge of a giant molecular cloud toward the northern constellation Cepheus, the glowing star forming region lies about 3,000 light-years away. Within the nebula, bright edges and tantalizing shapes are highlighted in this colorful skyscape. The image includes data from both broadband and narrowband filters, mapping emission from atomic oxygen, hydrogen, and sulfur into blue, green, and red hues. The atomic emission is powered by the energetic radiation from the hot stars, whose powerful winds and radiation also sculpt and erode the denser pillar shapes. Stars could still be forming inside the pillars by gravitational collapse, but as the pillars are eroded away, any forming stars will ultimately be cutoff from their reservoir of star stuff. This field spans around 30 light-years at the estimated distance of NGC 7822.
说明:气体和尘埃柱以及年轻炽热的恒星充满了NGC7822的中心。出现在北方仙王座巨大分子云边缘的是炽热的恒星形成区域,距离我们大约3,000光年远。在这张色彩斑斓的天空影像中,星云内明亮的边缘和突兀的形状显得异常突出。影像包含了宽带和窄带滤波器拍摄到的数据,分别是氧原子,氢原子以及硫原子发出的蓝色,绿色以及红色辉光。炽热恒星放射出的高能辐射激发原子,从而使之发光,恒星发出的高能风以及辐射还雕琢并侵蚀了浓密的柱状结构。在引力坍缩作用下,尘埃柱内部正在形成恒星,但是当气体尘埃柱被侵蚀完之后,任何正在形成中的恒星将最终断绝形成恒星所需要物质的供应。在NGC7822的距离上估计,这张影像大约覆盖30光年远。
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 楼主| 发表于 2009-08-29 14:31 | 显示全部楼层
2009 August 29

NGC 7771 Galaxy Group
Credit & Copyright: Kent Biggs
Explanation: Slide your cursor over the image to identify three members of this intriguing gathering of galaxies. Known as the NGC 7771 Group, they lie almost 200 million light-years away toward the high flying constellation Pegasus. The largest galaxy, barred spiral NGC 7771, is itself about 75,000 light-years across, but will someday find itself part of a larger galaxy still. As the galaxies of the group make repeated close passages, they will finally merge into one very large galaxy. Played out over hundreds of millions of years, the process is understood to be a normal part of the evolution of galaxies, including our own Milky Way. Editor's Note: The labeled version of the image was generated by Astrometry.net.
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 楼主| 发表于 2009-08-31 10:27 | 显示全部楼层
2009 August 30

D. rad Bacteria: Candidate Astronauts
Credit: Michael Daly (Uniformed Services University of the Health Sciences), DOE
Explanation: These bacteria could survive on another planet. In an Earth lab, Deinococcus radiodurans (D. rad) survive extreme levels of radiation, extreme temperatures, dehydration, and exposure to genotoxic chemicals. Amazingly, they even have the ability to repair their own DNA, usually within 48 hours. Known as an extremophile, bacteria such as D. rad are of interest to NASA partly because they might be adaptable to help human astronauts survive on other worlds. A recent map of D. rad's DNA might allow biologists to augment their survival skills with the ability to produce medicine, clean water, and oxygen. Already they have been genetically engineered to help clean up spills of toxic mercury. Likely one of the oldest surviving life forms, D. rad was discovered by accident in the 1950s when scientists investigating food preservation techniques could not easily kill it. Pictured above, Deinococcus radiodurans grow quietly in a dish.
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