"The intrinsically first being, the being that precedes and bears every worldly objectivity, is transcendental intersubjectivity: the universe of [transcendental subjects], which effects its communion in various [phenomenal] forms." — Edmund Husserl

The UFO narrative is a distractor. While I believe that there are other civilizations and alien visitors, I don't believe that they travel in spaceships that might crash and some dead aliens might be found. That's nonsense. Read this to understand why: https://misharogov.medium.com/what-dmt-induced-experiences-teach-us-philosophically-f9ee7f5c6929

P.S. Why are all UFOs of such primitive forms? Because when a psychonaut from another nexus of universal transcendental intersubjectivity visits our world, our nexus cannot constitute his body as it is constituted in his world (for our nexus doesn't have the corresponding causal structures), so it constitutes only a primitive phenomenal sign of his presence — a ball, a triangle, a "saucer", etc.