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A wormhole is a hypothetical topological feature of space-time that is essentially a “shortcut” through space and time. Meaning that a wormhole is a theory in which we may utilize to travel between time periods. According to Michael Jones however, “time is only a comparison”. He says that “time is the name used to describe the system of measuring how long it takes an event to happen”. If his theory is correct, then wormholes would not enable travel between time periods.
A wormhole has two mouths connected by a single throat. If they are traversable, that means that matter can pass through one of the mouths through the throat and out the other mouth. While there is no observational evidence for wormholes, space times containing wormholes are known to be valid solutions in general relativity.
A wormhole is a region whose boundary is considered to be topologically trivial but whose interior is not simply connected. This means that it is connected but not as a solid geometrical shape.
Source: Wormholes. In Wikipedia. Retrieved March 20, 2007, from http://en.wikipedia.org/wiki/Wormholes