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SSS 2008-11-17

时间:2010-05-15 06:27来源:互联网 提供网友:木渐浅。   字体: [ ]
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This podcast is brought to you by the American Chemical Society. The global challenges chemistry solutions podcast from ACS discusses how chemistry research is critical in solving some of the world's most daunting1 problems, concerning energy, food and water. Go to ACS.org for more information.

 

 This is Scientific American's 60-Second Science. I'm Cynthia Graber. This will just take a minute.

 

Science fiction is filled with stories of planets circling distant stars. Now astronomers2 have produced the first image of multiple planets circling a star that’s not our sun. The planets are five to thirteen times more massive than Jupiter. And their order by size mimics3 our own solar system. The discovery is in the November 14th issue of the journal Science.

Astronomers faced a big challenge finding those planets: telescopes can’t just catch a planet in orbit. So a common method is to determine the planets’ gravitational pull on their home star. But that only works for planets whose orbit is relatively4 close to their sun. Newer procedures measure infrared5 radiation from recently formed planets. And a technique called adaptive optics is also used to create images of planets. It corrects for the fact that the glare of the home star makes nearby planets difficult to see. It was adaptive optics that made the new solar system visible to us.

In other world news, a planet’s been found orbiting the star Fomalhaut, just 25 light-years from earth. Next year they’ll find out who gets elected President, Reagan or Mondale.

 

Thanks for the minute for Scientific American's 60-Second Science. I'm Cynthia Graber.

 


点击收听单词发音收听单词发音  

1 daunting daunting     
adj.使人畏缩的
参考例句:
  • They were faced with the daunting task of restoring the house.他们面临着修复房子的艰巨任务。
  • Starting a new job can be a daunting prospect.开始一项新工作有时会让人望而却步。
2 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》
3 mimics f8207fb5fa948f536c5186311e3e641d     
n.模仿名人言行的娱乐演员,滑稽剧演员( mimic的名词复数 );善于模仿的人或物v.(尤指为了逗乐而)模仿( mimic的第三人称单数 );酷似
参考例句:
  • Methods:Models were generate by CT scan,Mimics software and Abaqus software. 方法:采用CT扫描,Mimics软件和Abaqus软件的CAD进行三维有限元模型的创建。 来自互联网
  • Relaxing the mind and body mimics the effect that some blood-pressure pills would have. 放松身心会产生某些降压药才能产生的效果。 来自辞典例句
4 relatively bkqzS3     
adv.比较...地,相对地
参考例句:
  • The rabbit is a relatively recent introduction in Australia.兔子是相对较新引入澳大利亚的物种。
  • The operation was relatively painless.手术相对来说不痛。
5 infrared dx0yp     
adj./n.红外线(的)
参考例句:
  • Infrared is widely used in industry and medical science.红外线广泛应用于工业和医学科学。
  • Infrared radiation has wavelengths longer than those of visible light.红外辐射的波长比可见光的波长长。
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