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Giorgio Bianciardi University of Siena

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

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  1. Life in the Universe #1_2 Giorgio Bianciardi University of Siena

  2. LIFE ON EARTH CAME FROM THE UNIVERSE

  3. A galaxy among billions

  4. A galaxy among billions

  5. A galaxy, among billions

  6. A star, among billions

  7. A nebula, 5 billion years ago

  8. A star exploded

  9. A solar system born

  10. Our Sun born

  11. Planetesimals: billions > some planets

  12. Our Earth and the Moon

  13. Organics compounds from Cosmos

  14. 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 “

  15. 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”

  16. Nondeterministic Physics: life is structured randomness Fractals ECG L-Z = 0.66 = 1/f

  17. Life born on Earth 4.3-3.8 billion years ago Dyson, 1982 R. Popa, 2004

  18. EVOLUTION

  19. EVOLUTION

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