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Ast1141 #34DrakeEquation.pptx - The Drake Equation NRAO...

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The Drake EquationAstronomy 1141NRAO
What do we mean by “Intelligent Life”?A highly advanced technologicalcivilization.Capable of communicating across vastinterstellar distances.Capable of interstellar travel by advancedspacecraft.Interested in finding & communicatingwith other intelligences.In other words:life like us...Warner Bros.Is there intelligent life elsewhere in theuniverse?
You have to wonder sometimes…We’ve had radio communicationtechnology for ~100 years.Limited (short-duration)human spaceflight for~50 years.Spacecraft capable ofleaving our solar systemonly recently.NASAUMDo humans qualify as intelligent beingswith advanced technology?
Hubble (NASA/ESA)One reason to think intelligent life must havearisen elsewhere is the enormousnumberofstars100 billion (1011) galaxies in the visibleuniverse100 billion (1011) stars per galaxy10,000 billion billion (1022) stars
Hubble (NASA/ESA)If each star has justa one-in-a-trillionchance of being home to an advancedcivilization, there should bebillionsofcivilizations.
However, if each star has a one-in-a-trillion chance obeing home to an advanced civilization,then there would be atmostone in our galaxyright now.Which means,just us.The next large galaxy is~2 million light years away.NASA
TheDrake Equationis a way of estimating thenumber ofadvanced civilizationsin our galaxyright now.An “advanced civilization” is defined as onethat cancommunicate across interstellar distances.Frank DrakeLfffnfRNcilep
R*=rateof star formationfp= fraction of stars withplanetsne= number ofexoEarthsper planetarysystemfL= fraction of exoEarths withlifefi= fraction of life-bearing planets withintelligent lifefC= fraction of intelligent life withcommunicationtechnologyL=lifetimeof an advanced civilizationN=numberof advanced civilizationsNRfpnefLfifcL

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Term
Fall
Professor
Tendrup
Tags
Solar System, Planet, Extraterrestrial life

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