NASA: National Aeronautics and Space Administration

  1. Question

    Intelligent life has been discovered on how many planets?

    None. No life of any sort has yet been discovered on another planet. Take a look through the archive for Ask an Astrobiologist and you will find many answers that discuss the search for life beyond the Earth, including a few that deal with intelligent life. David Morrison
    NAI Senior Scientist

    November 7, 2007

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