CAS AR 202 Lecture Notes - Lecture 20: Milky Way, Drake Equation, Graham Hancock
5 Apr 2016
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Billions of galaxies; billions of stars; billions of planets. C: ne # of planets, per solar system, w/ a suitable environment for life, a-d: we know these numbers & have plugged them into this equaion. H. f1 fracion of suitable planets where life appears fi fracion of life bearing planets where intelligent life appears fc fracion of civilizaions that develop a technology that releases detectable signs of existence into space. L length of ime such civilizaions release detectable signals into space. J: possible answer: 34 million civilizaions on our galaxy. Sei (search for extra-terrestrial intelligence) insitute (frank drake) Life on mars: percival lowell astronomer from boston, believed there was life on mars, saw a series of canals & thought that they were built by a civilizaion.
