Giorgio Bianciardi
University of Siena
1976
Viking #1
Viking #2
Life on Mars ?
ALH84001
Life on Mars (billion years ago)?!
D.S. Mc Kay, Science, 1996
PAH
Titan: a Saturn moon
Jupiter moons
Fermi’s paradox: where are they?
5%
Liquid water
&
Time
90%
= 1:100
50%
Extrasolar planets
Stable orbits
= 1: 10 000..planets were life
could arise…
Life is rare / Intelligent life is very
and very rare