A parallel universe, also known as a parallel dimension, alternate universe or alternate reality, is a hypothetical self-contained plane of existence, co-existing with one's own. While the three terms are generally synonymous and can be used interchangeably in most cases, there is sometimes an additional connotation implied with the term "alternate universe/reality" that implies that the reality is a variant of our own, with some overlap with the similarly-named alternate history..

Most theories touch on how there are many different worlds, universes, dimensions, or whatever you would like to call them. Each one the same as our own, but

Parallel universes - Black Hole connected to a theoretical White Hole. - If the theoretical science is correct, there are an infinite number of universes with same situations and different outcomes, do you believe?

Explore the higher dimensions with Neil deGrasse Tyson, comic co-host Harrison Greenbaum, mathematician John Allen Paulos, and physicist James Kakalios.

Designed by London-based photographer Cameron Baxter A Comprehensive Guide To Navigating Parallel Dimensions is a lovely bought of retro-themed fakery...

Tom Siegfried, author of ‘The Number of the Heavens,’ discusses what the multiverse has meant to great thinkers throughout history.