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In 1952, papers speculated that flying saucers were "not carriers for the inhabitants of other planets" but rather that flying saucers "are the living creatures from another planet". [8] In 1953, Walter Karig speculated in American Weekly that the objects behaved more like "puppies" than spaceships.
The interdimensional hypothesis is a proposal that unidentified flying object (UFO) sightings are the result of experiencing other "dimensions" that coexist separately alongside our own [1] in contrast with either the extraterrestrial hypothesis that suggests UFO sightings are caused by visitations from outside the Earth or the psychosocial hypothesis that argues UFO sightings are best ...
In 1969 physicist Edward Condon defined the "extraterrestrial hypothesis" or "ETH" as the "idea that some UFOs may be spacecraft sent to Earth from another civilization or space other than Earth, or on a planet associated with a more distant star," while presenting the findings of the much debated Condon Report. Some UFO historians credit ...
Counter-Earth, a planet situated on the other side of the Sun from that of the Earth. Fifth planet (hypothetical), historical speculation about a planet between the orbits of Mars and Jupiter. Phaeton, a planet situated between the orbits of Mars and Jupiter whose destruction supposedly led to the formation of the asteroid belt. This hypothesis ...
The Rare Earth hypothesis maintains that life on Earth is possible because of a series of factors that range from the location in the galaxy and the configuration of the Solar System to local characteristics of the planet, and that it is unlikely that all such requirements are simultaneously met by another planet. The proponents of this ...
Seed worlds, or seeded worlds, are another popular subset of the genre. It involves a terraformed planet or a habitable, yet uninhabited planet being "seeded" by already existing species of animals, plants and fungi, which will speciate in order to fill the different niches by adaptive radiation. The focus can be on one or multiple species, but ...
Carbon planet: A terrestrial planet composed primarily of carbon, rather than silicon. Chthonian planet: A hot Jupiter whose outer layers have been completely stripped off by its parent star. Chlorine planet: A planet with significant amounts of free chlorine or hydrochloric acid. [2] Coreless planet: A terrestrial planet that has no metallic ...
The theory still faced criticism mostly due to doubts about how long spores would actually survive under the conditions of their transport from one planet, through space, to another. [25] Despite all the emphasis placed on trying to establish the scientific legitimacy of this theory, it still lacked testability; that was and still is a serious ...