Calculateur de l'Équation de Drake — Formule

The Drake Equation

N = R* × fp × ne × fl × fi × fc × L

  • R* = rate of suitable star formation (stars/year)
  • fp = fraction with planetary systems
  • ne = habitable planets per system
  • fl = fraction where life develops
  • fi = fraction developing intelligence
  • fc = fraction developing detectable technology
  • L = years a civilisation remains detectable

    • Formulated by Frank Drake in 1961, this is a framework for thinking about extraterrestrial intelligence, not a precise prediction. Estimates of N range from less than 1 to millions.

    Exemple Résolu

    Moderate estimates for each parameter.

    1. N = 1.5 × 1.0 × 0.2 × 0.13 × 0.01 × 0.01 × 10000
    2. = 1.5 × 0.2 × 0.13 × 0.01 × 0.01 × 10000
    3. = 1.5 × 0.2 × 0.13 × 1 = 0.039
    4. N ≈ 0.039 (suggests we may be alone in the Galaxy with these values)
    5. Adjusting L to 1 000 000 years gives N ≈ 3.9