Lecture 004 - The Drake Equation

Lecture 004 - The Drake Equation - 1 Bio1222 Lecture 5 -...

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Unformatted text preview: 1 Bio1222 Lecture 5 - Extraterrestrial Life Bio1222 The galaxy Speed of light 1.1 billion km/h Light year 9,460,730,472,580 km 2 Bio1222 Distance (and time) to Proxima Centauri Bio1222 2 Bio1222 Distance (and time) to Proxima Centauri Bio1222 Radio astronomy 3 Bio1222 N = N N = N s s f p n e f f l f f i f c L L N = Number of advanced civilizations in our galaxy N s = Number of stars f p = the fraction of those stars that have planets n e = number of planets that can potentially support life f l = the fraction of those planets that develop life f i = the fraction of planets that develop intelligent life f c = the fraction of planets willing and able to communicate L = average lifetime of a civilization The Drake equation Bio1222 N s 4 Bio1222 What fraction of stars have planetary systems? Can we detect extrasolar planets? Transit method Astometry/Doppler spectroscopy Direct imaging f p Bio1222 n e For each planetary system how many habitable planets?...
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This note was uploaded on 04/04/2009 for the course BIOLOGY 1222 taught by Professor Haffie during the Spring '09 term at UWO.

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Lecture 004 - The Drake Equation - 1 Bio1222 Lecture 5 -...

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