Parallel Universes

Parallel Universes are a theory that has been used to explain Time Travel, especially when claimants are wrong about the time they explained such as John Titor who otherwise is speculated to have been a hoax.

The Man from 2082 among a few others has claimed this is how it works.

A common belief is that perhaps time travelers in their bending of time and reality are actually going through various dimensions that all seem the same except for a few or many divergences in how history happened, such as the "Man from Taured" story.

Scientifically this theory has even been expanded to being called the "many-worlds interpretation", which implies that all possible alternate histories and futures are real, and represent an actual "world" within quantum mechanics.