Editing Wormholes (section)

==Natural wormholes==
Wormholes and the possibility of using them for time travel had been recognized by Human scientists since the 20th century. In 2368, Captain Jean-Luc Picard of the USS Enterprise-D agreed with faux historian Berlinghoff Rasmussen that using knowledge gained by means of time travel through a wormhole (for example, in order to save an endangered planet) could allow the "next Adolf Hitler" or Khan Noonien Singh to come into being. According to the captain, first year philosophy students had been asked the question ever since the first wormholes had been discovered. (TNG: "A Matter of Time") 

No known naturally-occurring stable wormholes had yet been discovered in the Alpha or Beta Quadrants. The only likely candidate, the Barzan wormhole, was found to be unstable at its far terminus. However, several relatively stable wormhole-like phenomena have been reported in the Delta Quadrant. (TNG: "The Price"; VOY: "Eye of the Needle", "Night", "Counterpoint")