There’s an interesting exposition of the reason why claims of alien (extra-terrestrial) contact with this planet is extremely unlikely.
I most agree with it: the distances, the length of time it would take technology to develop that would make interstellar travel possible, the sheer luck that would be needed to stumble upon another civilization.
In fact I would go further, I think there’s a chance civilizations discover something like limited control of anti-matter, which it only takes a single nutter to detonate, taking out an entire solar system. We call them “supernovas.” We assume they’re all natural phenomena. If the technology to travel between stars is as powerful but takes longer than the development of a self-extermination bomb, the latter will be developed first by a death cult (easier to make an UNCONTROLLED explosion than a controlled one). Therefore no two interstellar civilizations will ever meet. The upside of this is that this will always be fiction.
But that’s where I have to draw the line.