每个恒星都有行星围绕-凯发k8官网

每个恒星都有行星围绕
文章来源:未知 文章作者:enread 发布时间:2012-01-12 06:20 字体: [ ] 
(单词翻译:双击或拖选)

every star twinkling in the night sky plays host to at least one planet, a new study suggests.

一项新研究显示,夜空中闪烁的每个恒星都至少拥有一个行星。

that implies there are some 10 billion earth-sized planets in our 1.

using a technique called gravitational microlensing(微引力透镜) , an international team found a handful of exoplanets that imply the existence of billions more.

the findings were released at the 219th american 2 society (aas) meeting, alongside reports of the smallest "exoplanets" ever discovered.

gravitational microlensing is a method that uses the gravity of a far-flung star to 3 the light from even more distant stars that have planets.

4 used a number of 5 small telescopes that make up the microlensing network for the detection of small terrestrial exoplanets, or mindstep, to look for the rare event of one star passing directly in front of another as seen from earth.

the team witnessed 40 of these microlensing events, and in three instances 6 the effects of planets circling the more distant stars.

while the number of actual events and detected planets was low, the team was able to estimate how many such exoplanets(外部行星) must exist.

most news of exoplanets in recent years has come from the kepler telescope, which spots planets by looking for the slight dimming of their host stars' light as planets pass in front of them.

that method is better at finding large planets close to their host stars.

while a more difficult effect to catch, gravitational microlensing is better at finding planets of all sizes and distances.

it can currently spot a planet as small as mercury, orbiting at a similar distance to its host star, or as far away as 7.

the study, also published in the journal nature, was a 8 between researchers from more than 20 international institutes and universities.

"just the recent 15 years have seen the count of known planets beyond the solar system rising from none to about 700, but we can expect hundreds of billions to exist in the 9 way alone," said co-author dr martin dominik, from the university of st andrews, uk.



点击收听单词发音收听单词发音  

1 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。
2 ketyo     
adj.天文学的,(数字)极大的
参考例句:
  • he was an expert on ancient chinese astronomical literature.他是研究中国古代天文学文献的专家。
  • houses in the village are selling for astronomical prices.乡村的房价正在飙升。
3 iwgzw     
vt.放大,增强;详述,详加解说
参考例句:
  • the new manager wants to amplify the company.新经理想要扩大公司。
  • please amplify your remarks by giving us some examples.请举例详述你的话。
4 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》
5 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。
6 7feyj     
adj.有斑点的,斑纹的,弄污了的
参考例句:
  • the milkman selected the spotted cows,from among a herd of two hundred.牛奶商从一群200头牛中选出有斑点的牛。
  • sam's shop stocks short spotted socks.山姆的商店屯积了有斑点的短袜。
7 tszy1     
n.农神,土星
参考例句:
  • 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。
  • these comparisons suggested that saturn is made of lighter materials.这些比较告诉我们,土星由较轻的物质构成。
8 bw7yd     
n.合作,协作;勾结
参考例句:
  • the two companies are working in close collaboration each other.这两家公司密切合作。
  • he was shot for collaboration with the enemy.他因通敌而被枪毙了。
9 jd0xg     
adj.牛奶的,多奶的;乳白色的
参考例句:
  • alexander always has milky coffee at lunchtime.亚历山大总是在午餐时喝掺奶的咖啡。
  • i like a hot milky drink at bedtime.我喜欢睡前喝杯热奶饮料。
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