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      太陽威脅著地球

      放大字體  縮小字體 發(fā)布日期:2007-12-19
      核心提示:[1] When the end of the world comes, we'll know what to blame. Scientists have found compelling evidence that the Sun has a baby brother, a dark star whose eccentric orbit is responsible for periodically showering the Earth with comets and meteorite


          [1] When the end of the world comes, we'll know what to blame. Scientists have found compelling evidence that the Sun has a baby brother, a dark star whose eccentric orbit is responsible for periodically showering the Earth with comets and meteorites. 

          [2] The dark star--named Nemesis by astronomers--is thought to be a brown dwarf" that spins round the Sun in an orbit so large it is measured in light years, the distance light travels in a year, equivalent to about 6,000 billion miles.

          [3] The research suggests that, every 26m years, the star's eccentric orbit brings it within one light year of the solar system. There it causes havoc in the Oort Cloud, a huge region surrounding the solar system that contains billions of bits of cosmic rubble left over from the formation of planets.

          [4] Of the millions of rocks it throws out of orbit at each visit, some hurtle Earthwards--and have several times nearly wiped out life on Earth.

          [5] Astronomers have long wondered if the Sun has a smaller partner. Recently, two independent groups of researchers have found evidence of one.
       
          [1]當(dāng)世界末日來臨時(shí)我們將知道該去責(zé)備什么?茖W(xué)家們已發(fā)現(xiàn)明顯的跡象表明:太陽有一個(gè)小弟弟,它是一顆暗星,其偏心軌道導(dǎo)致彗星群和流星雨周期性降落地球。 

          [2]這顆被天文學(xué)家叫做復(fù)仇女神星的暗星被認(rèn)為是一顆"褐矮星",它圍繞太陽旋轉(zhuǎn)的軌道大得要用光年計(jì)量,光年是光在一年中走過的距離,大約等于 6萬億英里。

          [3]研究表明,每經(jīng)過2600萬年,這顆星的偏心軌道就將它帶到距太陽系1光年的范圍內(nèi)。在那里,它引起了奧爾特云的浩劫,奧爾特云是一個(gè)巨大的圍繞太陽系的區(qū)域,里面包含了數(shù)十億從行星形成中分離出來的宇宙碎塊。

          [4]它每一次訪問太陽系時(shí),都從軌道上甩出上百萬個(gè)巖塊,其中一些飛向地球的方向--有幾次幾乎摧毀地球上的生命。

          [5]天文學(xué)家長期以來一直懷疑太陽是否有一個(gè)小伴星。最近,兩個(gè)獨(dú)立的研究小組已經(jīng)發(fā)現(xiàn)了一些端倪。

       

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      關(guān)鍵詞: 太陽 威脅著 地球
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