S.E.T.I

    "SETI, the Search for Extraterrestrial Intelligence, is an exploratory science that seeks evidence of life in the universe by looking for some signature of its technology. "(the Center for SETI Research)

http://io9.com/380194/future-seti-looking-for-alien-lasers-gravity-waves

    Carl Sagan was a very public supporter of SETI, although he was never a researcher for the organization he was instrumental in getting the program started. Being one of the most famous supporters of the project Carl was an advocate of SETI from its beginning. He was in favor of listening for the evidence of other intelligent civilizations and not actively broadcasting signals, because he said " Other civilizations considerably more advanced than we would have substantially greater energetic resources and more advanced technologies to devote to transmission; our global long-term planning does not yet accommodate dialogues that could take many centuries for a single exchange." (Carl Sagan)

    Carl Sagan made the SETI program more famous with his book "Contact" in which a SETI researcher received instructions on how to build a machine that would take her to another world. His Book was later turned into a critically acclaimed motion picture.
           
           http://www.imdb.com/title/tt0118884/

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