Multiverse theory, reality, or simply an idea? Are parallel multiverses real or not? The answer is that we don't know. We have no observations about those things. And that means they are non-proven models or theories. Or, maybe we should call the multiverse: "logical continuum of the universe structures, or models". So, it's rather philosophy than a scientific theory. That model explains dark energy, dark matter, and other unknown things as the energy and particles that come from another universe. There are instances where the universe in which we live will fall back to a single point. And then form again. That model is called "phoenix universe". Or in some models, another universe exists in the fourth or higher dimensions. But those models are unproven.. And maybe they will be unproven forever. In some models, things like virtual reality are also part of the multiverse or parallel universe theories. Multiverse is the theoretical framework where the u...