According to Einstein's theory of general relativity, time is another dimension, just like the three dimensions (width, length and height) which make up the world we can see. If one was to imagine the fabric of spacetime- the 4 dimensions in which we experience life- it would not be smooth. At the subatomic level, a place called the quantum foam is constantly moving and vibrating in unpredictable patterns. As Stephen Hawking explains, “Nothing is flat or solid. If you look closely enough at anything you’ll find holes and wrinkles in it. It’s a basic physical principle, and it even applies to time. Even something as smooth as a pool ball has tiny crevices, wrinkles and voids."
It is in these tiny crevices in the quantum foam that wormholes are found. These "wormholes", so to speak, are holes in space and time through which one could theoretically, if the wormhole could be maintained and enlarged, travel; however, these tunnels are only billion-trillion-trillionths of a centimeter large, so unless physicists can find a way to maintain and enlarge one, we cannot send anything through. According to many physicists, this is theoretically possible, and we could one day send people or even spaceships through a wormhole.
Because wormholes are passages through both time and space, they are viable option for time travel. If a ship could fly through one and not change its position in space, only its position in time, it could time travel.
It is in these tiny crevices in the quantum foam that wormholes are found. These "wormholes", so to speak, are holes in space and time through which one could theoretically, if the wormhole could be maintained and enlarged, travel; however, these tunnels are only billion-trillion-trillionths of a centimeter large, so unless physicists can find a way to maintain and enlarge one, we cannot send anything through. According to many physicists, this is theoretically possible, and we could one day send people or even spaceships through a wormhole.
Because wormholes are passages through both time and space, they are viable option for time travel. If a ship could fly through one and not change its position in space, only its position in time, it could time travel.