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A '''wormhole''', in [[science fiction]], is a passage from one location in three-dimensional space to another. It is based on the concept that space has more than three dimensions, and that 3D space can be "folded" within 4D space much as a 2D piece of cloth can be folded within 3D space.  The [[General Theory of Relativity]] says that wormholes may exist.

A '''wormhole''', in [[science fiction]], is a speculative passage from one location in three-dimensional space to another. It is based on the concept that space has more than three dimensions, and that 3D space can be "folded" within 4D space much as a 2D piece of cloth can be folded within 3D space.  The [[General Theory of Relativity]] says that wormholes may exist. This has not been proven so far.

The significance of a wormhole is that it would allow a trip through it to take much less time than a journey between the same two points in conventional space.  The mouths of a wormhole may be at any two points in [[spacetime]], including at different times; this would allow time travel by going through the wormhole.<ref>[http://www.npl.washington.edu/AV/altvw33.html "Wormholes and Time Machines"], John G. Cramer</ref>

The significance of a wormhole is that it would allow a trip through it to take much less time than a journey between the same two points in conventional space.  The mouths of a wormhole may be at any two points in [[spacetime]], including at different times; this would allow time travel by going through the wormhole.<ref>[http://www.npl.washington.edu/AV/altvw33.html "Wormholes and Time Machines"], John G. Cramer</ref>