There are scientists/researchers within the ufology community that determine the phenomenon indigenous to earth is inter-dimensional in nature and not the workings of physical beings from another planet.
"One theory which can no longer be taken very seriously is that UFOs are interstellar spaceships."
- Arthur C. Clarke, New York Times Book Review, 07/27/75
"There seems to be no evidence yet that any of these craft or beings originate from outer space."
-Gordon Creighton, Official 1992 Flying Saucer Review Policy Statement
"A large part of the available UFO literature is closely linked with mysticism and the metaphysical. It deals with subjects like mental telepathy, automatic writing and invisible entities as well as phenomena like poltergeist [ghost] manifestation and 'possession.' Many of the UFO reports now being published in the popular press recount alleged incidents that are strikingly similar to demonic possession and psychic phenomena."
- Lynn E. Catoe, UFOs and Related Subjects: USGPO, 1969; prepared under AFOSR Project Order 67-0002 and 68-0003
"UFO behaviour is more akin to magic than to physics as we know it... the modern UFOnauts and the demons of past days are probably identical."
-Dr. Pierre Guerin, FSR Vol. 25, No. 1, p. 13-14
"The UFO manifestations seem to be, by and large, merely minor variations of the age-old demonological phenomenon..."
- John A. Keel, UFOs: Operation Trojan Horse, p. 299
"A working knowledge of occult science...is indispensable to UFO investigation."
-Trevor James, FSR Vol. 8, No. 1, p.10
Studies of flying saucer cults repeatedly show that they are part of a larger occult social world."
-Stupple & McNeece, 1979 MUFON UFO Symposium Proceedings, p. 49
"The 'medical examination' to which abductees are said to be subjected, often accompanied by sadistic sexual manipulation, is reminiscient of the medieval tales of encounters with demons. It makes no sense in a sophisticated or technical framework: any intelligent being equipped with the scientific marvels that UFOs possess would be in a position to achieve any of these alleged scientific objectives in a shorter time and with fewer risks."
- Dr. Jacques Vallee, Confrontations, p. 13
"The symbolic display seen by the abductees is identical to the type of initiation ritual or astral voyage that is imbedded in the [occult] traditions of every culture...the structure of abduction stories is identical to that of occult initiation rituals...the UFO beings of today belong to the same class of manifestation as the [occult] entities that were described in centuries past."
-Dr. Jacques Vallee citing the extensive research of Bertrand Meheust [Science-Fiction et Soucoupes Volantes (Paris, 1978); Soucoupes Volantes et Folklore (Paris, 1985)], in Confrontations, p. 146, 159-161
"[The occultist] is brought into intelligent communication with the spirits of the air, and can receive any knowledge which they possess, or any false impression they choose to impart...the demons seem permitted to do various wonders at their request."
- G.H. Pember, Earth's Earliest Ages and Their Connection with Modern Spiritualism and Theosophy (1876), p. 254