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  1. Ralph Dratman

    B How far outward can we rule out intelligent life?

    Or, successful technological civilizations use radio only for a few decades to a few centuries, because there is a better method of communication we do not know about yet.
  2. Ralph Dratman

    What are the ways we can search for alien life?

    What about volcanism? For one reason or another, it appears that Pluto may have an out-of-equilibrium atmosphere, whether or not much chemistry is involved.