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If it's true that there is little to no evidence that any technologically-developed life has visited our planet, could it be that no civilization in our galaxy has developed interstellar travel?
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April 3rd, 2012
If you think there might be a civilization in the Milky Way that has developed interstellar travel, why do you think they haven’t visited Earth?
If you think there is evidence that we have been visited by intentionally extraterrestrial travelers, what evidence or claims of evidence have you encountered?
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