What is life?
How did life arise on Earth?
How long ago?
What conditions are necessary?
Nutrients, energy, liquid water
Where should we look?
Search in the Solar System
Europa Surface Close up Interior Search
Mars had water blueberries
ALH84001 ‘The Face’
Extrasolar
What are the odds?
Drake equation calculator
N = Rstar fplanet nplanet fbio fintelligence fcommunication L
Optimists N = .01 L
Pessimists N = 1
Habitable Zones
SETI
Mostly in radio with bandwidth searchers None found yet
Earthlike Planet search
Terrestrial Planet Finder what it hopes to find
Why can’t we go there?
Why haven’t we seen them?
We are alone. Interstellar travel is too hard. zoo hypothesis
