Wormhole

Wormholes are a form of stable singularity that occurs when two spacial locations, often seperated by vast distances in Real-space, become linked together. This phenomena allows, with the proper technological know-how, safe and nearly-instantaneous travel between the two linked locations.

Some races have developed ways to utilize artificial wormholes in the creation of Jumpgates.

Naturally occuring wormholes have been documented; but the lack of exotic matter that should be required to hold them open remains baffling.