Gegan's irrefutable evidence.
The Distant Origin Theory was a scientific hypothesis developed by Voth scientist Forra Gegen in the 24th century, which stated that the Voth originated not in the Delta Quadrant, but on a distant planet.
For years, Gegan only had a theory, until 2373, when he found the remains of Voyager crewmember Hogan on Hanon IV. Analyzing his bone structure and DNA structure, Gegan found humans and Voth share 47 genetic markers.
After several weeks of investigation, Gegan was able to track down the USS Voyager, and analyze its crew. He eventually realized he was correct - humans had evolved from the same genetic ancestors as the Voth. Having presented his evidence to the Voth Ministry of Elders, they refuted his claims, and threatened to place him and the entire Voyager crew in prison unless he retracted his theory. Gegan sadly agreed, to protect his evolutionary "distant cousins". (VOY: "Distant Origin")
- It is unclear if Gegan himself created this theory, or if he merely worked on it as part of the Circles of Science. In addition, it is unclear how Gegen received a sample of Voyager's warp plasma from the Nekrit Supply Depot, as the sample Neelix used in "Fair Trade" was detonated.