Sidewise in Time analogizes time to the geographic coordinate system, with travel along latitude corresponding to time travel moving through past, present and future, and travel along longitude corresponding to travel perpendicular to time and to other realities, hence the name of the story. One of the first science fiction examples is Murray Leinster's short story, Sidewise in Time, in which portions of alternative universes replace corresponding geographical regions in this universe. Similarly in Persian literature, "The Adventures of Bulukiya," a tale in the One Thousand and One Nights, describes the protagonist Bulukiya learning of alternative worlds/universes that are similar to but still distinct from his own. The concept is also found in ancient Hindu mythology, in texts such as the Puranas, which expressed an infinite number of universes, each with its own gods. Plato reflected deeply on the parallel realities, resulting in Platonism, in which the upper reality is perfect while the lower earthly reality is an imperfect shadow of the heavenly. Heaven, Hell, Olympus, and Valhalla are all "alternative universes" different from the familiar material realm. While the four 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.įiction has long borrowed an idea of "another world" from myth, legend and religion. The sum of all potential parallel universes that constitute reality is often called a " multiverse". ( Learn how and when to remove this template message)Ī 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. Please consider expanding the lead to provide an accessible overview of all important aspects of the article. This article's lead section may be too short to adequately summarize the key points.
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