The Drake Equation is a probabilistic argument used to estimate the number of active, communicative extraterrestrial civilizations in the Milky Way galaxy. Use the interactive tool below to input your own estimates for each variable.
Standard estimate: 1.5 - 3 stars/year.
Recent data suggests almost all stars have planets (Estimate: 1.0).
Kepler data suggests 0.1 - 0.5 for Earth-like planets.
Highly uncertain (Estimate: 0.1 - 1.0).
Even more uncertain (Estimate: 0.01 - 1.0).
Estimate: 0.1 - 0.2.
The most critical variable. 100 years? 10,000 years?
Estimated Civilizations (N)
60
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Interpreting the Result
The number N represents the number of civilizations in our galaxy with which communication might be possible. If N is less than 1, it suggests we are likely alone. If N is significantly greater than 1, the galaxy could be teeming with life, yet we face the Fermi Paradox: "Where is everybody?"
This calculator demonstrates the sensitivity of the outcome to the variable L (Longevity). If technological civilizations tend to destroy themselves quickly (low L), the galaxy remains silent. If they survive for eons (high L), contact becomes inevitable.
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