It's basically mathematically impossible that there isn't other intelligent life in the Universe.
Whether they actually visited here in the past or are here now is anyones guess.
I would say 99% of the UFO sightings are secret Government operated air crafts though.
There's simply no reason why a bunch of Aliens would just fly around our skies for shits and giggles rather than coming down and making contact. Unless they just look at us like meaningless cockroaches and would have no use in making contact.
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