What Is The Drake Equation?

Josh explains Frank Drake's famous formula for determining whether intelligent alien life exists.

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SOURCES:

http://science.howstuffworks.com/planets-- universe-support- life.htm

http://science.howstuffworks.com/seti2.htm

http://science.howstuffworks.com/space/aliens-ufos/extraterrestrial- life-odds1.htm

Ruth, M. (2016). Drake equation. Salem Press Encyclopedia Of Science,
http://www.seti.org/drakeequation

Kluger, J. (2016). The Perfectly Sane Case for Life In Space. Time, 187(6/7), 104

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