What does the universe consist of?

The universe is indeed expanding. It seems that this has already been scientifically established and even explained. But what you suggest is quite a fantastic hypothesis. What is the connection? Does the electromagnetic field emitted by the brain have such an effect? o_O Or is there something even more mysterious? No, it's too early to talk about that. :) By the way, the human brain holds no fewer mysteries than the universe, but that's another story, or, if you like, off-topic. :) By the way... in cosmology, galaxy clusters are already identified. :) And between them, there are indeed incredibly vast distances. And that mysterious substance located between them (in theoretical models, it must exist) is called dark matter. Something like that. But so far, no one has seen it, kept it in test tubes, etc. It's one of the mysteries of the universe, let's say. As for parallel worlds in science fiction, they have a perfectly logical basis. Just as parallel lines can exist in a plane, and parallel planes can exist in space, parallel spaces can theoretically exist in the 4th dimension. And if we remember the famous astrophysicist Albert Einstein and time as the 4th dimension... there can be only guesses, in general. :)