According to a scientific study published in 2019, there are approximately 6 billion Earth-like planets in our Galaxy. With this amount of habitable planets, I find it quite difficult to imagine that there aren’t other technologically advanced civilizations in the Milky Way. Also, I’m quite open-minded, so I’m not one of those people who thinks that interstellar travel is impossible. The fact that our current technology does not allow us to build a warp drive/interstellar vehicle, does not make interstellar travel impossible. I personally think that it is very unfair and arrogant to assume that interstellar travel is impossible just because we can’t make it happen yet. Therefore, I tend to be very optimistic about the existence of alien life forms and the possibility of interstellar travel, and I’m quite convinced that there are many advanced civilizations in our Galaxy that can travel between the stars, and explore other solar systems.
Now, 95% of UFO sightings can be explained by conventional phenomena, and this is a fact on which all serious ufologists agree. But even though 95% of UFO sightings can be explained by conventional phenomena, I think that attributing the remaining 5% of unexplainable sightings to extraterrestrial spaceships (or probes) visiting our planet is a fairly plausible hypothesis. In my opinion, it explains very well the really unexplainable sightings that have occurred over the last 100 years. Which doesn’t mean that it is the only reasonable hypothesis, of course, but it is surely the one I personally find more plausible.
Furthermore, I am of the opinion that the Roswell incident might have involved a real alien ship, and that the US military could still be in possession of the fragments of the alien ship recovered at Roswell in 1947. There are more than 500 witnesses who have claimed to have seen something strange in Roswell (many of them were trained soldiers and other members of the military), and I don’t think that it is very rational to say that they all misremembered what they saw, or that they all lied. Some of them could have lied, and some of them could have misremembered what they saw, that’s for sure. But not all of them, that’s highly implausible in my opinion. The research made by nuclear physicist Stanton Freedman on the Roswell incident is excellent, and I highly recommend you his books on the subject.
However, even though I’m willing to entertain the possibility that some UFOs might be extraterrestrial spaceships and probes, and even though I’m willing to entertain the possibility that an alien shipped might have crashed at Roswell in 1947, I’m inclined to reject all the other popular aspects of the UFO folklore. For example, I don’t think that abductions, crop circles and cattle mutilations can be traced back to aliens, and I’m more inclined to believe that all these phenomena are man-made. Furthermore, I also don’t support the ancient astronaut theories, and I think that these theories can be attributed to a great lack of knowledge about ancient history. So again, even though I think that aliens might be visiting Earth, and even though I think that one of their ships might have crashed on Earth, I’m highly sceptical about everything else.