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Mathematical SETI

Part of the series Springer Praxis Books pp 111-129

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How many planets for man and aliens?

  • Claudio MacconeAffiliated withInternational Academy of Astronautics and Istituto Nazionale di Astrofisica Email author 

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Abstract

Let us now change topics completely! Rather than looking for ETs in the Galaxy, we now seek habitable planets for man in the Galaxy. How many are there and how far from us is the nearest such habitable planet?