Time-traveler UFO hypothesis

The time-traveler hypothesis, also known as chrononaut UFO, future humans, extratempestrial model and Terminator theory is the proposal that unidentified flying object are humans traveling from the future using advanced technology. Some notable people have given recent public exposure to the hypothesis, such as retired NASA aerospace engineer Larry Lemke, Wisconsin congressman Mike Gallagher, and American filmmaker Steven Spielberg.

The time-traveler hypothesis is considered extremely implausible by mainstream scholars and is generally regarded as unorthodox even among fringe conspiracy theorists who argue that UFOs are extraterrestrial spacecraft or inter-dimensional phenomena.