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NASA发现适合人类居住的新"地球"
送交者:  2011年12月06日07:56:48 于 [世界时事论坛] 发送悄悄话

NASA finds new Earth is right for life

Bridie Smith
December 7, 2011


Read more: http://www.smh.com.au/national/nasa-finds-new-earth-is-right-for-life-20111206-1oh82.html#ixzz1flcqYhAL
 

A PLANET capable of supporting life has been found in a distant solar system.

It has been dubbed Kepler-22b after NASA's Kepler space telescope, which first spied the planet in 2009. Scientists say its location in the habitable zone - where liquid water could exist - means conditions are right for the planet to support life.

Another feature giving astronomers hope is its relatively small size. Kepler-22b is just 2.4 times the size of the Earth, compared to Jupiter, which is 10 times larger than Earth.

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''Small planets tend to be the rocky planets,'' said Sydney University ARC postdoctoral fellow Dennis Stello, who works with Kepler. ''When looking for something that is Earth-like, we look for something that is roughly the same size, because if you have a big gas giant in the habitable zone, it's still a gas giant. You wouldn't have a surface you could walk on.''

Dr Stello works with NASA, aiding their planet hunting programs by assessing Kepler data, especially the variations in brightness of stars that have planets. These variations tell scientists about the interior of the star, which is key to understanding each planet system. Knowing the size of the star also helps estimate the size of the planet.

Dr Stello said confirmation this week that Kepler-22b was capable of supporting life was incredibly exciting.

''It's the first time that NASA has found such a small planet in the habitable zone and around a star that is very close to the sun,'' Dr Stello said. ''The system is the closest we have found yet to the system that we know.'' For now, the planet's composition remains a mystery, as scientists are yet to establish the mass of Kepler 22b. Whether the planet does support life also remains unknown.

What they do know is that Kepler 22b has its own sun-like star, which it orbits every 290 days. It is 600 light years away from its sun-like star.

Kepler 22b is the first planet in the habitable zone identified by the US space agency NASA and the third identified globally.

Earlier this year, French astronomers confirmed Gliese 581 d sat on the outskirts of the habitable zone. Just months later, HD 85512 b, one of the smallest planets outside our solar system, was discovered by Swiss astronomers in the habitable zone.

More than 700 ''exoplanets'' or planets outside our solar system have been spotted and verified in recent decades, while thousands more await confirmation by missions such as NASA's Kepler space telescope. Among these, only 15 planets and 30 moons are potentially habitable.

With GUARDIAN



Read more: http://www.smh.com.au/national/nasa-finds-new-earth-is-right-for-life-20111206-1oh82.html#ixzz1flcvt6Rq
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      哈哈,你太受欢迎了,所以大家都喜欢掐你 - 夜猫 12/06/11 (356)
          发张照片。其实透气是个好名字,就可惜 - 夜猫 12/06/11 (350)
            有没有味道?重吗?  /无内容 - horse625 12/06/11 (301)
              你养一下就知道了, - 透气 12/06/11 (299)
              看换窝是否勤快了,经常换的话,没啥味道  /无内容 - 夜猫 12/06/11 (284)
            OMG, she is so cute. - 透气 12/06/11 (312)
    比较一下,太阳到地球的距离,光大约走8分钟  /无内容 - 夜猫 12/06/11 (263)
      那个600光年应是到地球距离  /无内容 - 透气 12/06/11 (252)
  那地方根本就不能透气。 - 道友 12/06/11 (279)
  发现了也去不了。600光年。没戏。  /无内容 - x-file 12/06/11 (254)
    没有想像力,在飞船上繁衍X的X方代的小,小小,小小小...X  /无内容 - 透气 12/06/11 (247)
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        这个确实要事先搞清楚,不然成食物链中的美味就不好玩了  /无内容 - 透气 12/06/11 (264)
          霍金说的对,还是不要去惹外星人好。自己过自己的地球小日子。  /无内容 - x-file 12/06/11 (263)
            地球灭亡了大家都跟着根儿屁。然后说,我们曾经有过,那就够了。  /无内容 - x-file 12/06/11 (264)
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