英语 英语 日语 日语 韩语 韩语 法语 法语 德语 德语 西班牙语 西班牙语 意大利语 意大利语 阿拉伯语 阿拉伯语 葡萄牙语 葡萄牙语 越南语 越南语 俄语 俄语 芬兰语 芬兰语 泰语 泰语 泰语 丹麦语 泰语 对外汉语

SSS 2012-03-06

时间:2012-04-16 05:46来源:互联网 提供网友:gmeng   字体: [ ]
特别声明:本栏目内容均从网络收集或者网友提供,供仅参考试用,我们无法保证内容完整和正确。如果资料损害了您的权益,请与站长联系,我们将及时删除并致以歉意。
    (单词翻译:双击或拖选)

 This is Scientific American 60 Second Science, I am Cynthia Graber, this will just take a minute~

 
How can we search for life on exoplanets? Step one: examine the Earth as if it were an exoplanet. That’s the idea behind a recent look at earthshine.
 
Researchers aimed what’s officially called the Very Large Telescope, housed at the European Southern Observatory1, at the moon. They measured earthshine: sunlight that reflects off the Earth, hits the moon and bounces back.
 
The scientists are looking for hints of life in the light—such as evidence of the gases associated with organic life. Such gas signatures are generally tough to find, because any planetary light is swamped by the light of its host star.
 
But in this effort, the research team also took into account polarized light. Because light reflected off a planet is polarized. But light from the star is not.
 
The analysis of earthshine correctly revealed that the planet it came from has a partly cloudy atmosphere and is covered with oceans and some vegetation. The researchers could even ascertain2 changes in cloud cover and vegetation as the Earth turned. The research was published in the journal Nature.
 
Similar scrutiny3 of actual exoplanets may one day reveal the first good suspects for harboring life—via their light.
 
Thanks for the minute for Scientific American 60 Second Science, I'm Cynthia Graber. 

点击收听单词发音收听单词发音  

1 observatory hRgzP     
n.天文台,气象台,瞭望台,观测台
参考例句:
  • Guy's house was close to the observatory.盖伊的房子离天文台很近。
  • Officials from Greenwich Observatory have the clock checked twice a day.格林威治天文台的职员们每天对大钟检查两次。
2 ascertain WNVyN     
vt.发现,确定,查明,弄清
参考例句:
  • It's difficult to ascertain the coal deposits.煤储量很难探明。
  • We must ascertain the responsibility in light of different situtations.我们必须根据不同情况判定责任。
3 scrutiny ZDgz6     
n.详细检查,仔细观察
参考例句:
  • His work looks all right,but it will not bear scrutiny.他的工作似乎很好,但是经不起仔细检查。
  • Few wives in their forties can weather such a scrutiny.很少年过四十的妻子经得起这么仔细的观察。
本文本内容来源于互联网抓取和网友提交,仅供参考,部分栏目没有内容,如果您有更合适的内容,欢迎点击提交分享给大家。
------分隔线----------------------------
TAG标签:   sss  托福素材
顶一下
(0)
0%
踩一下
(0)
0%
最新评论 查看所有评论
发表评论 查看所有评论
请自觉遵守互联网相关的政策法规,严禁发布色情、暴力、反动的言论。
评价:
表情:
验证码:
听力搜索
推荐频道
论坛新贴