UFO conspiracy theories

pattern in a crop field

pseudoscientific claims of past alien contact

reptilian humanoids occurring in conspiracy theories and fantasy works

alleged Earth satellite of extraterrestrial origin

phenomenon of people being taken against their will or being intruded in their private space by alien beings according to their memory

theory

suspicion that facts of extraterrestrial visitors are kept secret from the general public

killing and mutilation of cattle in unusual and anomalous ways

hypothesis that some unidentified flying objects are occupied by extraterrestrial life

idea that says unidentified flying objects (UFOs) and related events involve visitations from other "realities" or "dimensions" that coexist separately alongside our own

UFOs reported by astronauts while in space