英语短文：小兄弟威胁着地球 1

英语短文：小兄弟威胁着地球 1 英语短文:小兄弟威胁着地球 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. 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. 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. 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. Astronomers have long wondered if the Sun has a smaller partner. Recently, two independent groups of researchers have found evidence of one. [1]当世界末日来临时我们将知道该去责备什么。科学家们已发现明 显的迹象表明:太阳有一个小弟弟，它是一颗暗星，其偏心轨道导致彗星群和流星雨周期性降落地球。 [2]这颗被天文学家叫做复仇女神星的暗星被认为是一颗“褐矮星”，它围绕太阳旋转的轨道大得要用光年计量，光年是光在一年中走过的距离，大约等于 6万亿英里。 [3]研究表明，每经过2600万年，这颗星的偏心轨道就将它带到距太阳系1光年的范围内。在那里，它引起了奥尔特云的浩劫，奥尔特云是一个巨大的围绕太阳系的区域，里面包含了数十亿从行星形成中分离出来的宇宙碎块。 [4]它每一次访问太阳系时，都从轨道上甩出上百万个岩块，其中一些飞向地球的方向——有几次几乎摧毁地球上的生命。 [5]天文学家长期以来一直怀疑太阳是否有一个小伴星。最近，两个独立的研究小组已经发现了一些端倪。 上一篇英语: 英语短文:小兄弟威胁着地球 2下一篇英语: 英语小说:爱要怎么说出口 12查看更多关于英文诗词的文章网友同时还浏览了: 我住在大海边 At History I m Hopeless 完美人生 懦夫在死之前，就已经死过多次 The Challenge A throe upon the features