Life in the Universe #1_2
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Life in the Universe #1_2. Giorgio Bianciardi University of Siena. LIFE ON EARTH CAME FROM THE UNIVERSE. A galaxy among billions. A galaxy among billions. A galaxy, among billions. A star, among billions. A nebula, 5 billion years ago. A star exploded. A solar system born.

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Giorgio bianciardi university of siena

Life in the Universe #1_2

Giorgio Bianciardi

University of Siena














Giorgio bianciardi university of siena

Exogenous delivery

IDPs =109 – 106 Kg C/yr

Airbust = 108 - 105 “

Comet = 106 - 103 “

Meteorites= 104 - 10 “

Impact synthesis

Post- impact plumes

= 104 – 10 Kg C/yr

Meteors = 103 - < 1 “

Airbust = 102- <1 “

50% H20

Endogenous source of prebiotic organics (neutral atmosphere)

Lightning = 37 Kg C/yr

Coronal Discharge = 26 “

UV light = 38 “


What is life

What is Life?

Life is a complex, ordered, chemical system able to replicate itself through autocatalysis and to make mistakes that gradually increase the efficiency of the autocatalysis

(A. Brack, modified)

 G =  H - T  S  S < 0 AND  G<0 if  H << 0

(liquid)

Bènard cells. (blood vessels)

Life is “soft matter”