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樟树市人民医院去痘多少钱飞度管家快速问答网

2017年10月21日 00:22:40|来源:国际在线|编辑:飞度技术快问
克瑞斯阿巴尼——人性的冥思201509/398082

栏目简介:《造物小百科How its made》介绍了许多东西的制作或者说发明方法,非常实用。其中的英语视频发音地道,内容浅显易懂,过程形象生动,是提高英语听力水平,积累英语知识和一些简单生活常识的好素材。201509/392010

And just once, it recorded a signal that got everyone excited,仅一次,它记录下一组激动人心的信号the ;wow!; signal, as it became known.也就是人们所熟知的wow信号The signal was a steady source of radio waves,信号显示了一阵稳定的无线电波来源just the kind an alien race might send,正是外星人可能发送的讯息类型because it stands out from the radio static that fills the universe.因为它从宇宙浩大的信息量中脱颖而出A computer recorded the signal as six letters and numbers.电脑以六个字母和数字记录下了这组信号Astronomer Jerry Ehman saw the data天文学家杰里·艾汉看过数据后and wrote one word in the margin.在页面边缘写下一个词Ehman and others subsequently searched the same patch of sky many times艾汉和他的同事们不断地搜寻这一片天空But found nothing.但却空手而归The ;wow!; signal had vanished.wow信号消失了The whole mysterious episode reveals that making contact整个神秘事件揭示了with aliens via radio is always going to be difficult.用无线电与外星人取得联系的难度巨大In such a vast universe,在浩瀚的宇宙中messages take a long time to reach their destination.信息需要许久才能抵达目的地The ;wow; signal appeared to come from a star system 200 light years away.wow信号似乎来自一个200光年外的星系So it took at least 200 years to reach us.所以这信号历经至少200年才传到地球If we sent a reply, it would take another 200 years to reach them,我们倘若回复,将耗费又一个200年传去信号by which time they might have forgotten they sent anything时至那时,它们也许已经忘记曾发送过信号and stopped listening for a reply.并早已放弃了等候回音Worse, they might well have destroyed themselves in the meantime.更糟的话,它们也许已经与此期间自我毁灭了The human race very quickly discovered the power of the atom bomb.人类在短时间内就发现了原子弹的威力If the same holds for intelligent aliens,如果智能外星人也有类似的发现then they might not last long.他们也许活不长久Perhaps they all blow themselves up soon after也许他们在发现Emc2不久后they discover that ;E; equals ;mc; squared.就已毁灭了自己If civilizations take billions of years to evolve如果文明要历经百万年才能形成only to vanish virtually overnight,毁于一旦只是瞬间的事情then, sadly, weve next to no chance of hearing from them.很遗憾,我们几乎不可能听到来自他们的消息They are simply too far away in space and time to reach.他们的空间和时间对我们而言都太遥不可及But there is one last possibility但也有最后一种可能:that aliens who have avoided destroying themselves有效避免了自我毁灭的外星人are aly colonizing the universe.正大张旗鼓地占领宇宙201506/381141

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