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i suspect most ufo's sighting were ussr/usa propeganda.
these stories of having ufo's were during the cold war.
its propeganda as the ones who have a ufo in thory have technology.
lets face it if they did have crashed ufo's and did not want people to know, thery would never get the story released.
i wouyld question any ufo going to earth. i find it unlikly that a ship will travel 4 million light years, fly over then fly off again. though if there are ufo's then chances are there arte lots of spacestations, and so far non have been seen.
and the question is why would any alien travel to earth? one has to remember that once you enter any planet you risk infecting or being infected by bugs. an alien could open its airlock and the bugs it carries wipe all life out without meaning to.
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