I kind of doubt it. Similar to my answer about the Roswell question, it seems unlikely to me that we could easily cover up aliens visiting the Earth. But really, without going there myself it’s hard to know for sure!
I definitely think there are aliens out there in the universe, because the probability of there being other planets out there that could support life is probably quite high.
But whether they exist at the same time as us and whether could reach us is another question.
If there were aliens powerful enough to reach us, I doubt our governments would be strong enough if to stop them or cover them up if they chose to want to meet the rest of us.
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