although it is possible some alien technology, from other world, be able to travel through space and visit our planet. i have a different view, and i am sure this theory has been explored. i think so call the UFOs are the vehicle of the time travelers. they are from our distance future many, perhaps hundreds of generations away. the reasons why there are no 3rd kind encounter is because the possibility creating paradox with great consequences with their world. so they can never "officially" contact us. if our government had captured or recovered some of these "aliens" maybe government have learned the fact that simply can not ever be revealed. the descriptions of these humanoids from people who encountered them, to me, sounds like generations of human evolution and the mutations result.
they are here simply to observe and research our life in this era and understand their past.
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