When I was much younger, I read We Are Not Alone, by Walter Sullivan. In the forty or so years since then, the search for life outside our own planet has become far more sophisticated, and yet we’re still at the point where we haven’t found any. Are we searching correctly? Do we need to expand our ideas of how and what forms of life might develop on other worlds?  Where should we look?

Dr. Athena Coustenis and Dr. Thérèse Encrenaz, both renowned astrophysicists, answer those questions in Life Beyond Earth: The Search for Habitable Worlds in the Universe. (Amazon link.)

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