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长期以来,人类对自身的存在充满着疑惑,UFO现象的出现更引起人们无尽的遐想,在地球之外是否存在与我们相似的地外文明,甚至有远远比我们聪明的外星人呢?那么,它们在哪里呢?先让我们搞清楚地外文明可能会是什么样? 地球以外的其他天体上可能存在的高级智慧生物的文明称地外文明。人类文明与地外文明合称宇宙
For a long time, mankind is full of doubts about his own existence. The emergence of the UFO phenomenon arouses endless reverie and whether there exist extraterrestrial civilizations outside of Earth similar to ours or even more intelligent than our aliens. So where are they? First, let us be clear about what civilization may be like for other cultures. "The civilization of the advanced intelligent creatures that may exist on other celestial bodies beyond Earth is called extraterrestrial civilization. Human civilization and extra-territorial civilization collectively called the universe