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RECALL THAT THE LEAST WELL-KNOWN FACTOR IN THE DRAKE EQUATION IS L AVERAGE LIFETIME OF A TECHNOLOGICAL CIVILIZATION

. ESTIMATING L IS IMPORTANT BECAUSE:1. IT ALLOWS US TO USE THE DRAKE EQUATION TO ESTIMATE HOW COMMON EXTRATERRESTRIAL CIVILIZATIONS ARE, AND, 2. EVEN MORE IMPORTANTLY, WE WOULD LIKE TO KNOW HOW LONG WE CAN EXPECT THE HUMAN RACE TO SURVIVE!. FACTORS THAT MAY LIMIT THE LIFETIME OF TECHNOLOGICAL

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RECALL THAT THE LEAST WELL-KNOWN FACTOR IN THE DRAKE EQUATION IS L AVERAGE LIFETIME OF A TECHNOLOGICAL CIVILIZATION

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