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外星人在哪？六种理论解释为何人类还没发现外星人
source link: http://tech.sina.com.cn/d/i/2017-12-26/doc-ifypyuvc1646105.shtml
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新浪科技讯北京时间12月26日消息，据国外媒体报道，在相对较短的时期内，我们取得了很多太空成绩。我们已经可以将人类送到月球，并在太空环境中生活，研制出大型精密望远镜，能够观测更遥远的太空区域，甚至火箭发射探测器至火星轨道，发射探测器至太阳系
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