there should be at least 36 civilizations within our Galaxy: this is a lower limit, based on the assumption that the average life-time, L, of a communicating civilization is 100 years. If spread uniformly throughout the Galaxy this would imply that the nearest CETI is at most 17K light-years away, and most likely hosted by a low-mass M-dwarf star, far surpassing our ability to detect it for the foreseeable future

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