There are several theories about aliens and other lifeforms where we don't even know about if they exist... A lot of people think they do. Me too.

"We" think that aliens really exist... but we don't know for sure...

There are several theories about aliens and alien abductions.... First of all is that there are no extra-terrestrials. No other life-forms ore what. You also have theories about the fact that they do exist: Because people think that there are other lifeforms, how far are they? Well, we don't know...
We speak of intelligent life. Then there is the question: How intelligent??? We don't know that either.
We think that there is intelligent life as intelligent as us...
WE DON'T KNOW FOR SURE...

Maybe they are smarter than us, because they know how to get here (At least that's what I think)...
It is also possible that we don't see Aliens or something like that, but we see "us". We see time travellers. Maybe humans of a few hundred years later. They came back to see how we lived, maybe they even did go a few thousands years ago... Maybe, maybe....
WE DON'T KNOW

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