Parallel universe

A parallel universe is a universe that is different from the observable universe. This may be because of time travel or other things.

Parallel universe may also be:

Science, physics and philosophy
 Multiverse, the hypothetical set of multiple possible universes
 The many-worlds interpretation of quantum physics

Fiction
 Parallel universes in fiction, alternative universes, worlds, realities and dimensions in fiction
 Alternative universe (fan fiction), fiction by fan authors that deliberately change facts of the universe written about
 List of fiction employing parallel universes

Music
 Parallel Universe (4hero album)
 Parallel Universe (Garnet Crow album)
 "Parallel Universe" (song), a 2000 song by the Red Hot Chili Peppers
 Kalakala: Songs from a Parallel Universe (with a song cycle for solo cello by Serena Tideman)

Literature, movies, & television
 "Parallel Universe" (Red Dwarf), a 1988 episode of Red Dwarf
 Parallel Universes (documentary), a 2001 BBC/Horizon documentary movie
 Mirror Universe, a fictional parallel universe in which several Star Trek television episodes take place

Other
 Parallel Universe (company), a movie company

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