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Class 10: Water/Life on Other Planets

Class 10: Water/Life on Other Planets. Astrobiology. 1.7. Billion years ago. 3.75. 4.5. Billion years ago. Billion years ago. 600. 500. 225. Million years ago. Million years ago. Million years ago. Life’s Sequence on Earth. Life As We Know It. Conditions for Life (I).

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Class 10: Water/Life on Other Planets

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  1. Class 10: Water/Life on Other Planets

  2. Astrobiology

  3. 1.7 Billion years ago 3.75 4.5 Billion years ago Billion years ago 600 500 225 Million years ago Million years ago Million years ago Life’s Sequence on Earth

  4. Life As We Know It

  5. Conditions for Life (I) Liquid water

  6. Conditions for Life (II) Carbon

  7. Conditions for Life (III) Energy

  8. Conditions for Life (IV) Stable Environment

  9. Life on Mercury? Moon?

  10. Life on Venus? Earth? Mars?

  11. Life on the Gas Giants?

  12. Life on Europa?

  13. Life on Titan?

  14. Life on Mars?

  15. The Habitable Zone

  16. Searching for Life: Biomarkers

  17. The Drake Equation Nc = N* x fp x nLZ x fL x fI x Fs = # of communicative civilization in galaxy Pessimistic Estimate Optimistic Estimate N*= # stars in galaxy 2x1011 2x1011 fp = fraction of stars w/planets 0.01 0.5 nLZ = number of planets in habitable zone 0.01 1 fL = fraction of planets where life could begin 0.01 1 fI = fraction of life forms that evolve to intelligence 0.01 1 Fs = fraction of star’s life where life communicates 10-8 10-4 Nc = 2x10-5 10x106 • Pessimist: we are alone • Optimist: many civilizations

  18. (SETI) SETI Institute Aricebo Search for Extraterrestrial Intelligence

  19. • Project Phoenix: primary search, nonprofit, $20M • SERENDIP: piggyback search of ordinary astronomy data • seti@home: SETI Projects Jill Tarter - 2.3 million users, - 1000 yrs computer time each day

  20. Effelsberg Big Ear Haystack Square Kilometer Array Arecibo SETI Telescopes

  21. The hmmmm….. Factor

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