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Since we are interest in estimating the number of alien civilizations from which we can receive signals, we only want to consider the alien civilizations who exist in a timeframe such that their radio signals can reach us while we are able to detect them.
Consider the three scenarios below and think about what the requirement of "current" means.
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select a time for alien radio signals to reach the earth
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Ultimately, deciding on what percent of radio technologies you believe to be current comes down to the lifespan of a civilization with radio technology. The longer civilizations have radio technology, the more radio technologies are current. Consider the selections below:
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select a civilization lifespan
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Your current choice for this term:
To update this value, return to the full equation page and change the value in the form.
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