The most disturbing unknown in the Drake Equation is the length of time a civilisation releases detectable signals. If we go by the most conservative estimates of all the terms, it means that it's almost inevitable for a civilisation to destroy itself after only a few centuries.
is it normal to belief in aliens?
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The most disturbing unknown in the Drake Equation is the length of time a civilisation releases detectable signals. If we go by the most conservative estimates of all the terms, it means that it's almost inevitable for a civilisation to destroy itself after only a few centuries.