Jason Colavito has a short post on the relationship of these three areas of study that’s a good interest-piquing piece if such connections are new to you. I can recommend it since it links ancient astronaut myths to utopian thinking on both sides of the political spectrum.
Last January one of my lectures at Future Congress was about alien mythology and utopianism. In simplest terms, the alien myth is a useful substitute for both religious and political rationalizations of fascism. Fascism, correctly understood, is about coercion, control over people’s lives. That wish is in no way isolated to the political right. The political left is in love with it as well, and it isn’t hard to demonstrate that, especially in academic source material.