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Lecture 35 The Drake Equation.pptx - The Drake Equation...

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The Drake EquationAstronomy 1141NRAO
In class activity: how many women are sleeping now with the pink “PINK®” pajama?N = Ntotalx fsleepingx fwomenx fpajamax fpinkx fPINK
What do we mean by “Intelligent Life”?A highly advanced technological civilization.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 the universe?
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 beings with advanced technology?
Hubble (NASA/ESA)One reason to think intelligent life must have arisen elsewhere is the enormous number of stars100 billion (1011) galaxies in the visible universe100 billion (1011) stars per galaxy10,000 billion billion (1022) stars
Hubble (NASA/ESA)If each star has just a one-in-a-trillion chance of being home to an advanced civilization, there should be billions of civilizations.
However, if each star has a one-in-a-trillion chance obeing home to an advanced civilization,then there would be atmost one in our galaxyright now.

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Term
Fall
Professor
Smita Mathur
Tags
Planet, Extraterrestrial life

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