Hypothetical Solar System bodies Hypothetical Solar System bodies Antichthon is a corresponding sphere opposite Earth according to Pythagoras. Pythagoras divided the universe into ten spheres, seen as ten concentric circles, the number ten symbolizing the completeness of all things. These circles began at the center with the globe of Divine Fire; then came the seven planets, the earth, and Antichthon which was never visible. ...more on Wikipedia about "Antichthon"
Chiron is the name given to a supposed moon of Saturn sighted by Hermann Goldschmidt in 1861. It has since been determined that no such moon exists. ...more on Wikipedia about "Chiron (moon)"
Counter-Earth is an Earth-like hypothetical planet, usually sharing an orbit with Earth but on the opposite side of the Sun. It was hypothesized by the Pythagorean school and was periodically speculated about, but its existence has been disproven by modern scientific models and observations. Nonetheless, it has appeared many times in science fiction stories, usually serving as an allegory for the real Earth. ...more on Wikipedia about "Counter-Earth"
Hypothetical Solar System bodies are heavenly bodies that have been suggested as possibly existing (or have been believed to exist), but have never been proven to actually exist, in the Solar System. This includes bodies that have later been proven not to exist. ...more on Wikipedia about "Hypothetical Solar System bodies"
Mercury's moon is the name used to refer to a moon of Mercury which was, for a short time, believed to exist. ...more on Wikipedia about "Mercury's moon"
Neith is the name given to an object first sighted by Giovanni Cassini, which he believed to be a moon of Venus. It has since been determined that no such moon exists. ...more on Wikipedia about "Neith (moon)"
Nemesis is the name given to a hypothetical red dwarf star or brown dwarf, orbiting the Sun at a distance of about 50,000 to 100,000 AU, somewhat beyond the Oort cloud. Richard A. Muller suggests that the most likely object is a red dwarf with magnitude between 7 and 12 ** . Such a bright object would undoubtedly already be in existing star catalogs, but its true nature would only be detectable by measuring its parallax; due to orbiting the Sun it would have a very low proper motion and would escape detection by proper motion surveys that have found stars like the 9th magnitude Barnard's star. ...more on Wikipedia about "Nemesis (star)" The text you are reading is from shortopedia
Planet X was a large hypothetical planet orbiting beyond the orbit of Neptune. (The X stands for unknown, rather than the Roman number 10.) Its existence, first as a ninth planet, and after 1930 as a tenth, was postulated on the basis of apparent discrepancies in the orbits of the gas giants, especially those of Uranus and Neptune. Those discrepancies have largely been resolved by modern measurement, removing the basis for Planet X. ...more on Wikipedia about "Planet X"
Ever since the discovery of Pluto, the existence of a tenth planet has been speculated by astronomers and the general public alike. Tenth planets have frequently appeared in fiction, and media reports of new trans-Neptunian object (TNO) discoveries have also used the label with some frequency. ...more on Wikipedia about "Tenth planet"
Theia (THAY-uh) is the hypothetical planet that, according to the giant impact theory of the Moon's formation, collided with Earth over four billion years ago. This impact at a glancing angle would have destroyed Theia, its iron core burying itself within the primordial Earth. Volatiles in its mantle and surface would become massive quantities of ejecta thrown into orbit around Earth. From that material the Moon coalesced in a matter of no more than a century, possibly within less than a month. Earth would have gained significant amounts of angular momentum from such a collision, as well as an increase in total mass to its current level. ...more on Wikipedia about "Theia (planet)"
On April 28, 1905, William H. Pickering, who had seven years earlier discovered Phœbe, announced the discovery of a tenth satellite of Saturn, which he promptly named Themis. The photographic plates on which it supposedly appeared, thirteen in all, spanned a period between April 17 and July 8, 1904. However, Pickering was mistaken and Themis does not exist. ...more on Wikipedia about "Themis (moon)"
Vulcan was the name given to a small planet proposed to exist in an orbit between Mercury and the Sun, in a 19th century hypothesis which has now been superseded by Albert Einstein's theory of general relativity. ...more on Wikipedia about "Vulcan (planet)"
Vulcanoids are hypothetical asteroids that may orbit in a dynamically stable zone between 0.08 and 0.21 astronomical units from the Sun, well within the orbit of Mercury. They take their name from the hypothetical planet Vulcan, which eighteenth-century astronomers fruitlessly searched for to explain the excess precession of Mercury's perihelion. The anomaly in Mercury's orbit later turned out to be an effect explained by general relativity, removing the need to postulate the existence of Vulcan. ...more on Wikipedia about "Vulcanoid asteroid"
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