well, alien anal, isaac asimov once stated that, since the earth has at least a 4.5 BILLION year hiostory, that the odds that we were visited by alien life in the 4.5 billion years before humanity came around (we have been aroundsomewhere between 1 million and 500 thousand years) are astronomically larger than to have been visited in the past 200 years.\
also, he stated there is no way to know that aliens are not crawling all ove rus at any second, because they could just as easily be microscopic to us, or macroscopic, too large for us to notice they are aliens.
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