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The '''extraterrestrial UFO hypothesis'''[{{cite book|last1=Donderi|first1=Don C. |chapter=Chapter 3 Science, Law, and War |chapter-url=https://books.google.com/books?id=UD5-AAAAMAAJ&dq=Extraterrestrial+hypothesis&pg=PA79|location=|editor-last1=Jacobs|editor-first1=David Michael |editor1-link=David Michael Jacobs|title=UFOs and Abductions Challenging the Borders of Knowledge|url=https://books.google.com/books?id=UD5-AAAAMAAJ|series=|pages=68, 76|publisher=[[University Press of Kansas]]|publication-date=3 October 2008|isbn=9780700610327 |access-date=27 June 2025|via=University of Michigan}}] or '''extraterrestrial hypothesis'''[{{cite book|last1=Dick|first1=Steven J. |author-link1=Steven J. Dick|date= 19 March 2001|chapter=5 The UFO Controversy and the Extraterrestrial Hypothesis|chapter-url=https://books.google.com/books?id=sk51eo3fKEgC&dq=Extraterrestrial+hypothesis&pg=PA138|location=|editor-last1=|editor-first1= |editor-last2=|editor-first2=|title=Life on Other Worlds The 20th-Century Extraterrestrial Life Debate|url=https://books.google.com/books?id=sk51eo3fKEgC|publisher=[[Cambridge University Press]]|page =138|isbn=9780521799126 |access-date=27 June 2025|via=}}][{{cite book|last1=Andresen|first1=Jensine |date=12 October 2021|chapter=10 Two Elephants in the Room of Astrobiology|chapter-url=https://books.google.com/books?id=rSREEAAAQBAJ&dq=Extraterrestrial+hypothesis&pg=PA193|location=|editor-last1=Seckbach |editor-first1=Joseph |editor-last2=Chon Torres|editor-first2= Octavio A. |editor-last3= Gordon|editor-first3=Richard|editor-last4=Peters|editor-first4=Ted|editor-link4=Ted Peters (theologian)|title=Astrobiology: Science, Ethics, and Public Policy|url=https://books.google.com/books?id=rSREEAAAQBAJ |publisher=[[Wiley (publisher)|Wiley]] & [[Scrivener publishing]]|pages=193–4 |isbn=9781119711162|issn=|url-status=|access-date=|via=}}][ ('''ETH'''][), synonymous with '''interplanetary aircraft'''{{efn|Used by the C.I.A. in a memorandum communication - July 1952][{{cite journal|last=Haines|first=Gerald K.|url=https://sgp.fas.org/library/ciaufo.html#ft12|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}}]}} and '''alien UFO technologies''', 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. |
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The '''extraterrestrial UFO hypothesis'''[{{cite book|last1=Donderi|first1=Don C. |chapter=Chapter 3 Science, Law, and War |chapter-url=https://books.google.com/books?id=UD5-AAAAMAAJ&dq=Extraterrestrial+hypothesis&pg=PA79|location=|editor-last1=Jacobs|editor-first1=David Michael |editor1-link=David Michael Jacobs|title=UFOs and Abductions Challenging the Borders of Knowledge|url=https://books.google.com/books?id=UD5-AAAAMAAJ|series=|pages=68, 76|publisher=[[University Press of Kansas]]|publication-date=3 October 2008|isbn=9780700610327 |access-date=27 June 2025|via=University of Michigan}}] or '''extraterrestrial hypothesis'''[{{cite book|last1=Dick|first1=Steven J. |author-link1=Steven J. Dick|date= 19 March 2001|chapter=5 The UFO Controversy and the Extraterrestrial Hypothesis|chapter-url=https://books.google.com/books?id=sk51eo3fKEgC&dq=Extraterrestrial+hypothesis&pg=PA138|location=|editor-last1=|editor-first1= |editor-last2=|editor-first2=|title=Life on Other Worlds The 20th-Century Extraterrestrial Life Debate|url=https://books.google.com/books?id=sk51eo3fKEgC|publisher=[[Cambridge University Press]]|page =138|isbn=9780521799126 |access-date=27 June 2025|via=}}][{{cite book|last1=Andresen|first1=Jensine |date=12 October 2021|chapter=10 Two Elephants in the Room of Astrobiology|chapter-url=https://books.google.com/books?id=rSREEAAAQBAJ&dq=Extraterrestrial+hypothesis&pg=PA193|location=|editor-last1=Seckbach |editor-first1=Joseph |editor-last2=Chon Torres|editor-first2= Octavio A. |editor-last3= Gordon|editor-first3=Richard|editor-last4=Peters|editor-first4=Ted|editor-link4=Ted Peters (theologian)|title=Astrobiology: Science, Ethics, and Public Policy|url=https://books.google.com/books?id=rSREEAAAQBAJ |publisher=[[Wiley (publisher)|Wiley]] & [[Scrivener publishing]]|pages=193–4 |isbn=9781119711162|issn=|url-status=|access-date=|via=}}][ ('''ETH'''][), synonymous with '''interplanetary aircraft'''{{efn|Used by the C.I.A. in a memorandum communication - July 1952][{{cite journal|last=Haines|first=Gerald K.|url=https://sgp.fas.org/library/ciaufo.html#ft12|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}}]}} and '''alien UFO technologies''', 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. |