" The multiverse is a hypothetical set of multiple possible universes that together comprise everything that exists: the entirety of space, time, matter, and energy as well as the physical laws and constants that describe them. Multiverses might sound like something from a comic book (and I’ve read a lot of them) but the theory has gained traction in cosmology, physics, astronomy, philosophy, psychology, and fiction. They are referred to as “alternative universes,” “quantum universes,” and “parallel dimensions.” It’s basically a model that predicts that we are just one of an infinite number of worlds, all of which have copies of ourselves going about their lives in a nearly identical pattern to our own. "

― Zak Bagans , Dark World: Into the Shadows with the Lead Investigator of The Ghost Adventures Crew