The extraterrestrial hypothesis (ETH) is the hypothesis A hypothesis is a proposed explanation for an observable phenomenon. The term derives from the Greek, ὑποτιθέναι - hypotithenai meaning "to put under" or "to suppose." For a hypothesis to be put forward as a scientific hypothesis, the scientific method requires that one can test it. Scientists generally base that some unidentified flying objects Unidentified flying object is the popular term for any aerial phenomenon whose cause cannot be easily or immediately identified by the observer. The United States Air Force, which coined the term in 1952, initially defined UFOs as those objects that remain unidentified after scrutiny by expert investigators, though the term UFO is often used more (UFOs) are best explained as being extraterrestrial life Extraterrestrial life is defined as life which does not originate from planet Earth. The word "extraterrestrial" is derived from the Latin extra and terrestris ("earthly", "of or relating to the Earth"). The existence of such life is theoretical and all assertions about it remain disputed or space aliens from other planets An extrasolar planet, or exoplanet, is a planet that orbits a star other than the Sun and that is thus beyond the Solar System. As of 18 December 2009)[update], there are 415 planets listed in the Extrasolar Planets Encyclopaedia. The vast majority of them have been detected through radial velocity observations and other indirect methods rather occupying physical spacecraft A spacecraft is a craft or machine designed for spaceflight. Spacecraft are used for a variety of purposes, including communications, earth observation, meteorology, navigation, planetary exploration and space tourism. Spacecraft and space travel are common themes in works of science fiction visiting Earth Earth is the third planet from the Sun, and the fifth-largest of the eight planets in the Solar System. It is also the largest, most massive, and densest of the Solar System's four terrestrial (or rocky) planets. It is sometimes referred to as the World, the Blue Planet,[note 3] or Terra.[note 4].
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But a year into his investigations, Keel realised that this hypothesis was untenable. "I abandoned the extraterrestrial hypothesis in 1967, ...
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