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SSS 2008-02-18

时间:2010-05-13 02:36来源:互联网 提供网友:0922013129   字体: [ ]
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    (单词翻译:双击或拖选)

This is Scientific American’s 60-Second Science. I’m Steve Mirsky. got a minute?

 

Earth-like planets have the potential to form around many—and perhaps most—of the nearest stars that are like our sun. Michael Meyer of the University of Arizona announced that discovery Sunday at the annual meeting of the American Association for the Advancement1 of Science. Meyer says that between 20 and 60 percent of the stars are candidates for the development of rocky planets. 

 

The researchers is using the NASA Spitzer Space Telescope. Meyer explains: “With Spitzer, we detect the heat radiation of dust grains, not unlike the smoke that you will see rising from chimneys.” Models say that the observed warm dust is consistent with small rocky bodies smashing into each other.“From those observations of dust, we infer the presence of colliding larger rocky bodies, not unlike asteroids2 and other things in our solar system that we know bang together and generate dust. By tracing that dust, we trace these dynamical processes that we think led to the formation of the terrestrial planets in our solar system.”

 

Thanks for the minute, for Scientific American's 60-Second Science from the AAAs meeting in Boston, I'm Steve Mirsky
 


点击收听单词发音收听单词发音  

1 advancement tzgziL     
n.前进,促进,提升
参考例句:
  • His new contribution to the advancement of physiology was well appreciated.他对生理学发展的新贡献获得高度赞赏。
  • The aim of a university should be the advancement of learning.大学的目标应是促进学术。
2 asteroids d02ebba086eb60b6155b94e12649ff84     
n.小行星( asteroid的名词复数 );海盘车,海星
参考例句:
  • Asteroids,also known as "minor planets",are numerous in the outer space. 小行星,亦称为“小型行星”,在外太空中不计其数。
  • Most stars probably have their quota of planets, meteorids, comets, and asteroids. 多数恒星也许还拥有若干行星、流星、彗星和小行星。
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