This classic work of popular science explores the possibility of extraterrestrial life and the implications of such a discovery for religion, philosophy, and ethics. The author covers a range of topics, from astronomy and physics, to biology and theology, to argue that there is strong evidence to support the existence of other worlds and the likelihood of life on other planets. He also considers the ethical and spiritual implications of such a discovery, and suggests that it could ultimately bring humanity closer together in a shared sense of awe and wonder.

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