If what we've been told about space is true, then they almost certainly exist. But space is so vast that I think it's unlikely they've ever visited us. If we were ever visited by a non human intelligence, I think its more likely it'd be interdimensional as opposed to extraterrestrial, because then all they would have to do is open a portal as opposed to travel several lightyears. But at the same time, I dont think we know if other dimensions even exist in the first place.
So to answer your question, my opinion is that it's possible but I think it's unlikely that another intelligence knows about us.
interdimensional
What the fuck does that mean? Gobbledy-gook.
Best way I can explain it is with an example: if you're religious, think of Heaven and Hell. They dont exist in this plane of reality, they exist in their own plane of reality. They are two different dimensions, and our world we live in is also a different dimension from those two.
Now imagine Heaven, Hell and our universe aren't the only dimensions. What if there are other dimensions? What if the beings from those dimensions could open a portal and travel to our dimension? Is it even possible? Do other dimensions apart from Heaven, Hell and our dimension even exist? I wish I could answer those questions, but we'll probably never know.
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