Calculadora da Equação de Drake
Estime o número de civilizações detectáveis na Via Láctea usando a equação de Drake.
Detectable Civilisations (N)
0.04
Detectable Civilisations (N) vs Civilisation Lifetime (L)
Formula
## 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.
Exemplo Resolvido
Moderate estimates for each parameter.
- 01N = 1.5 × 1.0 × 0.2 × 0.13 × 0.01 × 0.01 × 10000
- 02= 1.5 × 0.2 × 0.13 × 0.01 × 0.01 × 10000
- 03= 1.5 × 0.2 × 0.13 × 1 = 0.039
- 04N ≈ 0.039 (suggests we may be alone in the Galaxy with these values)
- 05Adjusting L to 1 000 000 years gives N ≈ 3.9
Perguntas Frequentes
Is the Drake equation scientific?
It is a useful probabilistic framework, not a testable equation. Most parameters are poorly constrained, especially fl, fi, and fc. It structures the search for extraterrestrial intelligence.
What is the Fermi Paradox?
If N is large, where is everybody? The apparent absence of evidence for alien civilisations despite high estimates from the Drake equation is called the Fermi Paradox.
Which parameter is most uncertain?
L (civilisation lifetime) and fl (life formation probability) are the most uncertain, each spanning orders of magnitude in estimates.