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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 need for the planet as an explanation for Mercury's orbital peculiarities was later rendered unnecessary when Einstein's 1915 theory of general relativity showed that Mercury's departure from an orbit predicted by Newtonian physics was explained by effects arising from the curvature of spacetime caused by the Sun's mass. [3] [4]
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 ...
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 ...
Ocean planet: A planet whose surface is covered entirely by deep oceans. Superhabitable planet: A terrestrial planet that is more habitable than Earth. Tidally detached exomoon: A planet that was originally a moon but has become gravitationally detached. Toroidal planet: A planet whose shape resembles a torus or doughnut. Trojan planet
Science fiction authors who wrote after Wells often used fictional creatures in the same vein, but most such imaginary faunas were small and not very developed. [3] A four-armed "Green Martian" riding a "thoat" from Edgar Rice Burroughs's Barsoom, a fictional version of the planet Mars. Illustration by James Allen St. John (1920).
Schematic diagram of the orbits of the fictional planets Vulcan, Counter-Earth, and Phaëton in relation to the five innermost planets of the Solar System.. Fictional planets of the Solar System have been depicted since the 1700s—often but not always corresponding to hypothetical planets that have at one point or another been seriously proposed by real-world astronomers, though commonly ...