Interesting thoughts Serge. But, if ancient civilizations (either from this planet or brought to this planet) existed and then extinguished themselves, where is the geological evidence of their existence?
We find the remains of flora and fauna from the mesozoic era and even further back into the geological record. But there has never been, to my knowledge, the discovery of ancient civilizations, their buildings or structures, beyond the Mesopotamian Civilization around 8000 BC.
If some other civilization existed that pre-dated Mesopotamia, say even by millennia, and were sophisticated enough to develop and use nukes, there would have to be some geological evidence of their existence.
Unless of course they just came here to experiment and promptly left thereafter.
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