Editing Extraterrestrial UFO hypothesis (section)

{{Short description|Hypothesis that some unidentified flying objects are created by extraterrestrial life}}
{{Multiple issues|
{{more citations needed|date=March 2015}}{{Lead too short|date=July 2023}}
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{{Ufo}}

The '''extraterrestrial hypothesis''' ('''ETH'''; ''synonymous with'' '''interplanetary aircraft''' {{efn|Used by the C.I.A. in a memorandum communication - July 1952<ref>{{cite journal|last=Haines|first=Gerald K.|url=https://sgp.fas.org/library/ciaufo.html#ft12|website=|title=A Die-Hard Issue CIA's Role in the Study of UFOs, 1947-90|journal=[[Studies in Intelligence|Stud. Intell.]]|volume= 01|issue=1|date=1997|publisher=Congressional Research Service - [[Federation of American Scientists]]|access-date=4 May 2025|archive-url=https://archive.today/20250504065908/https://sgp.fas.org/library/ciaufo.html%23ft12|archive-date=4 May 2025|quote=see Haines: Early CIA Concerns, 1947-52 ref.12: www.cia.gov/resources/csi/static/cia-role-study-UFOs.pdf: "Stone, memorandum to Machle." "Clark, memorandum for DDI, 29 July 1952" |via=(CIA quoted) in: Lomas (2024) DOI:10.29202/phil-cosm/32/3 - The “Prosaic” Turn para. 2}}</ref>}})  proposes that some [[unidentified flying object]]s (UFOs) are best explained as being physical [[spacecraft]] occupied by [[extraterrestrial intelligence|intelligent extraterrestrial organisms]] ([[Extraterrestrial life|non-human aliens]]) from [[extrasolar planet|other planets]], or [[Space probe|probe]]s designed by [[Extraterrestrial life|extraterrestrial]]s.