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The Fermi Paradox

The Fermi Paradox

My slides for Blinkist's learning session.

Presented on Feb 03, 2016, at Blinkist's HQ.


Leandro Favarin

February 03, 2016


  1. “Where is everybody?” –Enrico Fermi

  2. None
  3. Some numbers… 1022 to 1024 stars/universe 100 Billion to 400

    Billion stars in our galaxy 100 Billion to 400 Billion galaxies in universe
  4. 10 000 stars out there! For EVERY GRAIN of SAND

    on every beach on Earth: vs
  5. 22% to 50% Sun-like stars: Sun-like with Earth-like planet: For

    EVERY GRAIN of SAND in the world, there are 100 Earth-like planets 5% to 20% (size, temperature, luminosity)
  6. % of planets that develops life 1% 99% % of

    planets with advanced life (like us) 99% 1%
  7. Milky Way galaxy: 1 billion Earth-like planets 100 000 intelligent

  8. Where is everybody?

  9. None
  10. None
  11. * Type I Civilization * Type II Civilization * Type

    III Civilization Ability to use all of the energy on their planet Can harness all of the energy of their host star Blows the other two away, accessing power comparable to that of the entire Milky Way galaxy Kardashev Scale
  12. So where is everybody?

  13. The Fermi Paradox

  14. None
  15. None
  16. Explanation Group 1: those explanations which assume that there’s no

    sign of Type II and Type III Civilizations because there are none of them Explanation Group 2: those which assume they’re out there and we’re not seeing or hearing anything for other reasons
  17. The Great Filter

  18. 1.We are rare 2.We are first 3.We are f*cked

  19. We’re rare (The Great Filter is Behind Us)

  20. We’re the First

  21. We’re Fucked (The Great Filter is Ahead of Us)

  22. Explanation Group 2: Type II and III intelligent civilizations are

    out there—and there are logical reasons why we might not have heard from them.
  23. Possibility 1) Super- intelligent life could very well have already

    visited Earth, but before we were here
  24. Possibility 2) The galaxy has been colonized, but we just

    live in some desolate rural area of the galaxy
  25. Possibility 3) The entire concept of physical colonization is a

    hilariously backward concept to a more advanced species
  26. Possibility 4) There are scary predator civilizations out there, and

    most intelligent life knows better than to broadcast any outgoing signals and advertise their location
  27. Possibility 5) There’s only one instance of higher- intelligent life—a

    “superpredator” civilization (like humans are here on Earth)—who is far more advanced than everyone else and keeps it that way by exterminating any intelligent civilization once they get past a certain level
  28. Possibility 6) There’s plenty of activity and noise out there,

    but our technology is too primitive and we’re listening for the wrong things
  29. Possibility 7) We are receiving contact from other intelligent life,

    but the government is hiding it
  30. Possibility 8) Higher civilizations are aware of us and observing

    us (AKA the “Zoo Hypothesis”)
  31. Possibility 9) Higher civilizations are here, all around us. But

    we’re too primitive to perceive them
  32. Possibility 10) We’re completely wrong about our reality

  33. Closing thoughts: Whatever the truth actually is, it’s mind-blowing It’s

    a blow to our species’ self-esteem when comparing the universe to our small kingdom here on Earth We’re probably not as smart as we think we are
  34. All credits are to Leandro Favarin