<a class="link" rel="nofollow" href="http://www.FreeScienceLectures.com<br">http://www.FreeScienceLectures.com<br</a> /><br />The most famous American astronomer and astrophysicist Carl Sagan explains the Drake equation.<br /><br />The Drake equation (rarely also called the Green Bank equation or the Sagan equation) is a famous result in the speculative fields of xenobiology, astrosociobiology and the search for extraterrestrial intelligence.<br /><br />The Drake equation states that:<br />N = R*
