According to 21st century Mathematician Matt Visser, a wormhole could be constructed by confining exotic matter with negative mass to narrow regions to form the edges of three-dimensional volume, for example the edges of a cube. The faces of the cube would resemble mirrors, except that the image is of the view from the other end of the wormhole. Although there is only one cube of material, it appears at two locations to the external observer. The cube links two ‘ends’ of a wormhole together. A traveller, avoiding the edges and crossing through a face of one of the cubes, experiences no stresses and emerges from the corresponding face of the other cube. The cube has no interior but merely facilitates passage from ‘one’ cube to the ‘other’.
It was the Machine People of the Fomalhaut Polis who first turned Matt Vissers theories into reality. They built the first working Visser Cube during the early part of the 25th century (Old Earth Reckoning).
The faces of a Visser Cube are effectively contiguous elements of space time – there’s no tube, no “corridor” through which stuff travels. To the object passing through the cube, no subjective elapsed time is experienced. However, to an external observer a variable amount of time elapses between an object entering one cube and exiting another.This variable time can be anything from minutes to years.
The two termini of a Visser cube have to be built “together”, and only once the complex and delicate mechanisms have been tuned to one another can they be separated.
By the time humanity encountered the Machine People in the late 26th century, their Machine Polis’ were connected by a network of Visser Cubes – some only large enough to transport human-sized matter, while others, such as the Fomalhaut-Sirius Nexus, are large enough to transport vast interstellar vessels.
