These lecture notes adress the question: "Are we alone or are there millions of advanced life forms in the universe?" by examining life on Earth, the origin of life on Earth, the possiblity that life exists in our solar system or elsewhere.
%0 Electronic Source %A O'Connell, Robert %D 2004 %T Life in the Universe %V 2020 %N 2 July 2020 %9 text/html %U http://www.faculty.virginia.edu/rwoclass/astr1210/guide23.html
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