The Physics that Make Time Travel Possible

Time travel is not just science fiction, it's a scientific possibility. Humans have long dreamed of the possibility of traveling through time. Since Einstein came up with the Theory of Relativity, we have a hypothesis on how to make it possible. The Theory of Relativity defines time as a 4th dimension of space, meaning you move through time the same way you move through space (eg. when you go from point A to B).

Since that moment, time travel has become a scientific possibility, and in 1957 two physicist John Wheeler and Charles Misner came up with a concrete concept that can make time travel possible, called a wormhole.

Imagine a piece of paper with two points on it. Usually, if you want to travel from one point to the other, you must go all the way around the edge of the paper. But if you had a wormhole, it would be like punching a hole in the paper and folding it so that the two points are touching. Now, you can travel directly from one point to the other through the wormhole, which would allow you to move faster than time.

We have not found a wormhole yet in the Universe, so all we know is that theoretically is physically possible to exist. But over 100 years ago, it was considered entirely impossible before Einstein came up with the Theory of Relativity. What else might we consider impossible that we will discover ways to be plausible in the future?

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