I remember my teachers mocking me when I was saying that if the Sun is a star it's rather logical there are planets around other stars and that the view that they don't exist is the extreme one, but I was scoffed at that this is "pure speculation" and "science fiction".

On the other hand, when seeing a model of atom and solar system for the first time I was convinced reality is a set of layers with the micro- and macrocosm being just the two closest ones we're able to perceive, but I'm far less sure of it now.