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从19世纪以来,世界各地不断地出现目击不明飞行物(英文缩写为UFO)的报道或传闻,特别是20世纪50年代有空间科学以来,"UFO"、"飞碟"、"外星人"的目击事件与日俱增。在这些报道中,UFO像是"幽灵"一样出没于地球的空域。随着宇宙科学的发展,人们愈来愈关切在茫茫的大宇宙中,除了地球人之外,究竟有没有"外星人",或者说是否存在地外智慧生命?如果说"有",他(她)们究竟是什么模样?生活在宇宙的何方?地球人应怎样寻找他(她)们呢?