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Reply #28: Civilizations separated by space AND time [View All]

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Terry in Austin

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Tue Jan-18-05 05:03 PM
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28. Civilizations separated by space AND time

Most of the speculation about intelligent alien life has to do with the distribution of potential homeworlds throughout space. Given a 13+ billion year old universe, intelligent life would have been able to evolve and go extinct a number of times. Species (on Earth, anyway) tend to last on average only a few million years.

So, while it's likely enough (according to Drake) that our galaxy could be home to 1000+ civilizations, the odds of even a few occurring in the same era are a lot smaller.

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