I've always thought that time travelling humans was one of the better justifications for UFO's. Any civilization advanced enough to time travel, would understand how dangerous that technology would be in the hands of self-destructive monkeys like us.
I've heard that it would be alot easier travelling back in time than moving forward. Imagine yourself in a big tree, climbing to the bottom of the tree is easy, but getting back to the exact branch you started at is much more difficult.
I think for our civilization lacks the knowledge to make any conclusive statements on time travel, its all just shots in the dark.
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