the Search for Extra-Terrestrial Intelligence
At this site, produced by the Search for Extraterrestrial Intelligence (SETI) Institute, you can find out about the ongoing search for intelligent life beyond the solar system. Don't miss the section "SETI Science." There, you can see the diagram that was coded into the famous 1974 Aricebo radio message, detectable anywhere in the galaxy. You can find out about the Drake equation, which provides an estimate of the number of technological civilizations in the universe. And you can learn how characteristics of Earth and the solar system lead the the assertion that Earth was somewhow optimized to support intelligent life.
%0 Electronic Source %A Search for Extra-Terrestrial Intelligence, %D 2003 %T SETI Institute %V 2017 %N 17 December 2017 %9 text/html %U http://www.seti.org/
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