earth is a very limited plane (intentionally) and "aliens" that visit earth simply manifest things into existence using astral powers. they have no need for technology and see it as baby tier garbage. their "UFOs" arent technological they're magical, simply manifested and "just work". space isn't what they tell us, it's the astral plane, earth is in an artificial bubble blocking out 99% of the astral frequencies creating a limited subset of reality.