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美澳英研究称太阳系外可能存在第二个地球

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heid 发表于 2012-12-20 13:35 | 显示全部楼层 |阅读模式 来自: 中国–浙江–温州 电信
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雄心一生 发表于 2012-12-20 13:38 | 显示全部楼层 来自: 中国–河北–石家庄 联通
天啊?重量是地球的5倍, 想想 一个重100斤的人到那个行星上, 重量超过了500斤。很难啊
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法拉利ss 发表于 2012-12-20 20:14 | 显示全部楼层 来自: 中国–重庆–重庆 电信
它的质量是地球的五倍,重力加速度也是五倍吗?好象没有五倍吧。

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这个要到星球上才知道  详情 回复 发表于 2012-12-21 00:44
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人与自然 发表于 2012-12-21 00:33 | 显示全部楼层 来自: 中国–广东–中山 电信

美澳英研究称太阳系外可能存在第二个地球


                               
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在距离地球大约12光年以外,发现的有可能是“第二个地球”的行星

  【环球网综合消息】据日本《朝日新闻》12月19日消息,由英美澳等国家的相关人士组成的研究小组当地时间19日发布消息称,在距离地球大约12光年以外,发现了有可能是“第二个地球”的行星。迄今为止,在已发现的太阳系外可能有生命存在的行星中,该行星离地球最近。
  研究小组发现,在秋季可用肉眼辨别的星座“鲸鱼座”T星周围,有5颗重量是地球的2到6倍的行星。研究小组已经确认,在其中一颗行星上的“哈比塔布鲁逊”区域,生命存在必不可少的水可以以液体形式存在。
  据悉,此行星的重量是地球的5倍,可能有大气存在,与T星的距离与太阳与金星的距离相近,公转周期约为168天。
  研究小组的结论是基于对用3种不同的观测设备观测出的6千条以上观测数据的分析而得出的。英国赫特福德郡大学的詹姆斯·杰肯斯客座研究员表示:“在不远的将来,我们也许可以分析出这些行星的大气成分。“(实习编译:李哲 审稿:王欢)
(原标题:美澳英研究称太阳系外或存在第二个地球)

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 楼主| heid 发表于 2012-12-21 00:44 | 显示全部楼层 来自: 中国–浙江–温州 电信
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人与自然 发表于 2012-12-21 01:28 | 显示全部楼层 来自: 中国–广东–中山 电信
本帖最后由 人与自然 于 2012-12-21 01:34 编辑

http://www.dailymail.co.uk/sciencetech/article-2250451/Habitable-world-discovered-orbiting-Sun-twin-just-12-light-years-away-visible-Earth.html
A planet that could support life orbits a twin of our own Sun which is so close it is visible to the naked eye, scientists revealed today.
The world is one of five thought to be circling Tau Ceti, a star just 12 light years away which is almost identical to the sun.
Astronomers estimate the Tau Ceti planets to be two to six times bigger than Earth. One of them, with five times the Earth's mass, lies in the star's 'habitable zone'.


                               
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An artist's impression of the Tau Ceti system: A planet with conditions that could support life orbits the system, whose star is almost a twin of our own Sun, scientists revealed today

Also known as the 'Goldilocks zone', this is the orbital region that is neither to hot nor too cold to allow liquid surface water and, potentially, life.
Tau Ceti can be seen in the night sky in the constellation of Cetus, the whale. Details of the discovery are to appear in the journal Astronomy & Astrophysics.
Because of the difficulties involved in detecting extra-solar planets, most found so far have had high masses.
The Tau Ceti planetary family is thought to be the lowest mass solar system yet detected.
Scientists from Australia, Britain, Chile and the U.S. found the planets using a highly sensitive technique that combined data from more than 6,000 observations from three different telescopes.
They used the radial velocity method which looks for 'wobble' in a star's movement caused by the gravitational tug of planets.


                               
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Visible to the naked eye: Tau Ceti is just 12 light years from our own corner of the galaxy and can be seen in the night sky, but scientists had to use delicate measurements to detect and describe its planets

Dr James Jenkins, a member of the international team from the University of Hertfordshire, said: 'Tau Ceti is one of our nearest cosmic neighbours and so bright that we may be able to study the atmospheres of these planets in the not-too-distant future.
Read more: http://www.dailymail.co.uk/sciencetech/article-2250451/Habitable-world-discovered-orbiting-Sun-twin-just-12-light-years-away-visible-Earth.html#ixzz2FcDa51a1
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