哈勃望远镜拍摄到唯美的“星际气囊”
文章来源:未知 文章作者:meng 发布时间:2010-12-15 01:33 字体: [ ]  进入论坛
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The delicate shell, photographed by the NASA/ESA Hubble Space Telescope, appears to float serenely1(安详地,沉着地) in the depths of space, but this apparent calm hides an inner turmoil2(混乱,骚动) . The gaseous3 envelope(气囊,气膜) formed as the expanding blast wave and ejected material from a supernova(超新星) tore through the nearby interstellar medium(星际物质) . Called SNR B0509-67.5 (or SNR 0509 for short), the bubble is the visible remnant of a powerful stellar explosion in the Large Magellanic Cloud (LMC), a small galaxy4 about 160 000 light-years from Earth. Ripples5 seen in the shell's surface may be caused either by subtle variations in the density6 of the ambient(周围的,外界的) interstellar gas, or possibly be driven from the interior by fragments from the initial explosion. The bubble-shaped shroud7 of gas is 23 light-years across and is expanding at more than 18 million km/h.

Astronomers8 have concluded that the explosion was an example of an especially energetic and bright variety of supernova. Known as Type Ia, such supernova events are thought to result when a white dwarf9 star in a binary10 system(二进制) robs its partner of material, taking on more mass than it is able to handle, so that it eventually explodes.

Hubble's Advanced Camera for Surveys observed the supernova remnant on 28 October 2006 with a filter that isolates11 light from the glowing hydrogen seen in the expanding shell. These observations were then combined with visible-light images of the surrounding star field that were imaged with Hubble's Wide Field Camera 3 on 4 November 2010.

With an age of about 400 years, the supernova might have been visible to southern hemisphere observers around the year 1600, although there are no known records of a "new star" in the direction of the LMC near that time. A much more recent supernova in the LMC, SN 1987A, did catch the eye of Earth viewers and continues to be studied with ground- and space-based telescopes, including Hubble.



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1 serenely Bi5zpo     
adv.安详地,宁静地,平静地
参考例句:
  • The boat sailed serenely on towards the horizon.小船平稳地向着天水交接处驶去。
  • It was a serenely beautiful night.那是一个宁静美丽的夜晚。
2 turmoil CKJzj     
n.骚乱,混乱,动乱
参考例句:
  • His mind was in such a turmoil that he couldn't get to sleep.内心的纷扰使他无法入睡。
  • The robbery put the village in a turmoil.抢劫使全村陷入混乱。
3 gaseous Hlvy2     
adj.气体的,气态的
参考例句:
  • Air whether in the gaseous or liquid state is a fluid.空气,无论是气态的或是液态的,都是一种流体。
  • Freon exists both in liquid and gaseous states.氟利昂有液态和气态两种形态。
4 galaxy OhoxB     
n.星系;银河系;一群(杰出或著名的人物)
参考例句:
  • The earth is one of the planets in the Galaxy.地球是银河系中的星球之一。
  • The company has a galaxy of talent.该公司拥有一批优秀的人才。
5 ripples 10e54c54305aebf3deca20a1472f4b96     
逐渐扩散的感觉( ripple的名词复数 )
参考例句:
  • The moon danced on the ripples. 月亮在涟漪上舞动。
  • The sea leaves ripples on the sand. 海水在沙滩上留下了波痕。
6 density rOdzZ     
n.密集,密度,浓度
参考例句:
  • The population density of that country is 685 per square mile.那个国家的人口密度为每平方英里685人。
  • The region has a very high population density.该地区的人口密度很高。
7 shroud OEMya     
n.裹尸布,寿衣;罩,幕;vt.覆盖,隐藏
参考例句:
  • His past was enveloped in a shroud of mystery.他的过去被裹上一层神秘色彩。
  • How can I do under shroud of a dark sky?在黑暗的天空的笼罩下,我该怎么做呢?
8 astronomers 569155f16962e086bd7de77deceefcbd     
n.天文学者,天文学家( astronomer的名词复数 )
参考例句:
  • Astronomers can accurately foretell the date,time,and length of future eclipses. 天文学家能精确地预告未来日食月食的日期、时刻和时长。 来自《简明英汉词典》
  • Astronomers used to ask why only Saturn has rings. 天文学家们过去一直感到奇怪,为什么只有土星有光环。 来自《简明英汉词典》
9 dwarf EkjzH     
n.矮子,侏儒,矮小的动植物;vt.使…矮小
参考例句:
  • The dwarf's long arms were not proportional to his height.那侏儒的长臂与他的身高不成比例。
  • The dwarf shrugged his shoulders and shook his head. 矮子耸耸肩膀,摇摇头。
10 binary jybzWZ     
adj.二,双;二进制的;n.双(体);联星
参考例句:
  • Computers operate using binary numbers.计算机运行运用二进位制。
  • Let us try converting the number itself to binary.我们试一试,把这个数本身变成二进制数。
11 isolates 338356f90b44ba66febab4a4c173b0f7     
v.使隔离( isolate的第三人称单数 );将…剔出(以便看清和单独处理);使(某物质、细胞等)分离;使离析
参考例句:
  • The transformer isolates the transistors with regard to d-c bias voltage. 变压器可在两个晶体管之间隔离直流偏压。 来自辞典例句
  • In regions with certain isolates of TRV, spraining is more prominent. 在具有TRV某些分离物的地区,坏死是比较显著的。 来自辞典例句
TAG标签: space Hubble supernova
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