It has been many years since Drake produced his equation about how many intelligent, technological aliens there could be in the universe. In 1961 we had not discovered a single exoplanet. And we now have a much broader definition of life.
On the other hand, we now know of many more ways in which a civilisation can destroy itself.
So is it time to review the Drake Equation? Or the Fermi paradox? (Why don’t...
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