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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 ...
Pluto (minor-planet designation: 134340 Pluto) is a dwarf planet in the Kuiper belt, a ring of bodies beyond the orbit of Neptune.It is the ninth-largest and tenth-most-massive known object to directly orbit the Sun.
Liais, therefore, was "in a condition to deny, in the most positive manner, the passage of a planet over the sun at the time indicated". [18] Based on Lescarbault's "transit", Le Verrier computed Vulcan's orbit: it supposedly revolved about the Sun in a nearly circular orbit at a distance of 21 million kilometres (0.14 AU; 13,000,000 mi).
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 ...
On the planet Nalthis . Tears of Edgli: Vibrantly colored flowers that grow only in the temperate T'Telir climate. Highly valuable both economically and magically. [19] On the planet First of the Sun (Sixth of the Dusk); Unnamed Telepathic Trees: Many flora and fauna on this planet communicate with a form of natural telepathy. Certain unnamed ...
Coreless planet: A terrestrial planet that has no metallic core. Desert planet: A terrestrial planet with little to no water. Extragalactic planet: A planet that is located outside the Milky Way galaxy Eyeball planet: A tidally locked planet where uneven heating of the surface induces spatial features resembling a human eye. Helium planet
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 ...
The discrepancies remained through to the 1990s when the astronomer Robert Harrington put forward his hypothesis for an extra planet beyond Neptune with, as one example, a semi-major axis 101.2 AU and eccentricity 0.411 which makes its perihelion 59.60, so the closest to the Sun it would get is one and a half times the distance to Pluto.