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Well whether any aliens are "advanced" is a separate question. I'm positive aliens exist because earth being the only planet in all the universe to have intelligent life is extremely unlikely.
Assuming they are advanced, to some extent, I'm sure earth has been visited already. They just haven't officially revealed themselves. Maybe the government has proof or they've chosen to only observe us.
Every UFO/Alien encounter can't be false. I don't know that aliens are anything like we seen in movies but I hope they are. Not hostile but really technologically advanced.
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