how does one "know" we are not alone in the universe. UFOs? A UFO does not have to be extra terrestrial, they could be terrestial. I dont think I have heard anything about humans traveling to another planet and discovering life, much less humans traveling to another solar system light years away. I have not heard of anyone sending us encrypted messages with blueprints for a stargate yet. And of you knew the mathematical probability for life being on Earth alone, much lees what the probability for life being on another planet somewhere else, you would have to rethink your position? So if you know we are not alone, where, when and especially how, did you come to this conclusion?
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