Many-worlds interpretation David Deutsch argues that the way to understand the double-slit experiment is that in each universe the particle travels through a specific slit, but its motion is affected by the interference with particles in other universes. This creates the observable fringes.

Certain scientists have theorized that there may be another universe out there right alongside ours. Some believe there could be an infinite number of such universes, which they call parallel universes.

Originated by US physicist Hugh Everett in the late 1950s, this envisions our Universe as just one of numerous parallel worlds that branch off from each other, nanosecond by nanosecond, without intersecting or communicating.

The multiverse hypothesis posits that our universe is not the solitary entity we once believed it to be. Instead, it may be just one of an infinite number of parallel universes, each with its own laws of physics and properties. Some may even house alternate versions of ourselves, living out entirely different lives!