Multiple realities
(covers information from several alternate timelines)
(covers information from several alternate timelines)
![USS Voyager emits an anti-tachyon pulse](https://cdn.statically.io/img/static.wikia.nocookie.net/memoryalpha/images/4/47/USS_Voyager_emits_an_anti-tachyon_pulse.jpg/revision/latest/scale-to-width-down/180?cb=20180814105658&path-prefix=en)
Voyager uses an antitachyon pulse to seal a temporal rift.
An antitachyon is a subatomic particle, the antimatter equivalent of a tachyon.
In 2378, Captain Kathryn Janeway ordered the use of an antitachyon pulse to seal a temporal rift, which had been generated by Janeway's counterpart from the year 2404. (VOY: "Endgame")