View
221
Download
0
Tags:
Embed Size (px)
Citation preview
Physics 202: Introduction to Astronomy – Lecture 24
Carsten Denker
Physics DepartmentCenter for Solar–Terrestrial
Research
May 2, 2006 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 Life in the solar
system Life on Earth Miller-Urey
experiment Alternative
biochemistries Interstellar origin Diversity and culture
Intelligent life? Drake equation Search for
extraterrestrial intelligence
The “Water Hole”
May 2, 2006 Center for Solar-Terrestrial Research
Chemical Evolution
May 2, 2006 Center for Solar-Terrestrial Research
Drake Equation
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
p e l i cN R f n f f f L
May 2, 2006 Center for Solar-Terrestrial Research
Habitable Zones
May 2, 2006 Center for Solar-Terrestrial Research
Anybody out there?