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originally posted by: Maverick7
The Universe is nothing if not the best possible quarantine machine one could ever conceive. We have not only distance, radiation, near vacuum, extreme cold, time synch (existence during the same epoch) and the expansion of space-time, we also have the need for a civilization to be able to leave their home planet and after creating a duplicate world, try to become space-faring.
It just has not had time to happen yet, nor is it likely to.