Frank Morring, Jr., reports that scientists seem content searching for life in our Solar System, with an emphasis on Mars and the larger planets’ moons (AW&ST May 26/June 2, p. 19). But what if everything that is unique about Earth is actually a requirement for life? This would include an axis tilt that results in seasons, and a moon that not only provides tidal shifts but is the same angular diameter as the host star. While it may seem difficult to conceive their relevance as ...


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