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Extraterrestrial UFO hypothesis
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==Usage of the term== The term ''extraterrestrial hypothesis'' in printed material was used by Janine and [[Jacques Vallée]] in their 1966 book.<ref>{{cite book|last1=Vallée|first1=Jacques |last2=Vallée|first2=Janine|year=1966|title=Challenge to science: the UFO enigma|url=https://archive.org/details/challengetoscien00vall/mode/2up?q=extraterrestrial+hypothesis|publisher=[[Henry Regnery Company]]}}</ref> It was used in a publication by French engineer [[Aimé Michel]] in 1967,<ref>{{cite book |first=Michel |last=Aimé |year=1967 |title=The Truth About Flying Saucers |publisher=Pyramid Books |asin=B0007DRR38}}</ref> by [[James E. McDonald]] {{efn| of [[University of Arizona]] Institute of Atmospheric Physics <ref name=BC68/>}} in March 1968 {{efn|was speaking at the Canadian Astronautics and Space Institute's annual astronautics symposium <ref name=BC68/>}} <ref name=BC68>{{cite web|author=Bob Cohen|date=March 13, 1968|url=https://news.google.com/newspapers?id=WWNkAAAAIBAJ&pg=892,4105658&dq=extra-terrestrial-hypothesis&hl=en|title=UFOs 'Trick Of Vision' |publisher=[[The Calgary Herald]] - Google News Archive Search|website=news.google.com}}</ref> and again by McDonald and [[James Harder (ufologist)|James Harder]] {{efn| while testifying before the Congressional Committee on Science and Astronautics}} in July 1968.<ref name=harder1>{{cite web |url=http://ncas.sawco.com/ufosymposium/harder.html |title=Testimony of Dr. J. A. Harder before the Congressional Committee on Science and Astronautics, 29 July 1968 |date=October 2006 |url-status=dead |archive-url=https://web.archive.org/web/20060206064749/http://ncas.sawco.com/ufosymposium/harder.html |archive-date=6 February 2006 }}</ref> Skeptic [[Philip J. Klass]] used it in his 1968 book ''UFOs--Identified.''<ref>{{cite book|url=https://books.google.com/books?id=u9bS1YhiSa4C&q=%22extraterrestrial+hypothesis%22|title=UFOs--identified|first=Philip J.|last=Klass|date=1 February 1968|publisher=Random House|isbn=9780394450032|via=Google Books}}</ref> Some UFO historians credit [[Edward Condon]] c.1969 with popularizing the term and its abbreviation "ETH."
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