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Originally Posted by KRL
I think there is a distinct possibility there was a civilization on earth that got obliterated by a meteor strike or even where some were able to escape to another planet and the aliens that have come back are actually our ancient ancestors.
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Not likely
There would have to be some evidence of a civilization that has progressed that far with technology
Our civilization isn't yet capable of colonizing another planet and look at the mess our technology has left behind through.
I believe science is close to being on the money tracing the steps of evolution
By no means is it perfect.. but it's in the ballpark