Multiple realities
(covers information from several alternate timelines)
(covers information from several alternate timelines)
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")