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外星人在哪里？揭秘9种人类还未发现外星人科学理由
source link: https://tech.sina.com.cn/d/s/2018-10-09/doc-ifxeuwws2279822.shtml
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新浪科技讯北京时间10月9日消息，外星人在哪里？60多年前的一个夜晚，物理学家恩里科·费米（EnricoFermi）仰望星空，问道：“人都在哪儿啊？”他问的是外星人。后来这个问题就被称为“费米悖论”，阐述了地外文明存在性的过高估计与缺少相关
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