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									Physics 202: Introduction to
  Astronomy – Lecture 24

        Carsten Denker
        Physics Department
Center for Solar–Terrestrial Research
May 2, 2006   Center for Solar-Terrestrial Research
                   Cosmic Evolution




May 2, 2006   Center for Solar-Terrestrial Research
              Life in the Universe
 Life in the universe            Intelligent life?
 Life in the solar               Drake equation
  system                          Search for
 Life on Earth                    extraterrestrial
 Miller-Urey                      intelligence
  experiment                      The “Water Hole”
 Alternative
  biochemistries
 Interstellar origin
 Diversity and culture
May 2, 2006         Center for Solar-Terrestrial Research
              Chemical Evolution




May 2, 2006   Center for Solar-Terrestrial Research
                   Drake Equation
              
  N  R  f p  ne  fl  fi  fc  L
   R*: Rate of  star formation
   fp: Fraction of stars with
    planetary systems
   ne: Number of habitable planets
    per planetary system
   fl: Fraction of planets on which
    life arises
   fi: Fraction of life-bearing planets on which intelligence
    arises
   fc: Fraction of planets on which intelligent life develops
    and uses technology
   L: Average lifetime of a technological civilization
May 2, 2006              Center for Solar-Terrestrial Research
                          Habitable Zones




May 2, 2006   Center for Solar-Terrestrial Research
              Anybody out there?




May 2, 2006        Center for Solar-Terrestrial Research

								
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