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Proposals that there could be planets orbiting inside Mercury's orbit were put forward by British scientist Thomas Dick in 1838 [8]: 264 and by French physicist, mathematician, and astronomer Jacques Babinet in 1846 who suggested there may be "incandescent clouds of a planetary kind, circling the Sun" and proposed the name "Vulcan" (after the ...
A and B, two super-Earth (or even supergiant) planets theorized by Michael Woolfson as part of his Capture theory on Solar System formation. Originally the Solar System's two innermost planets, these two collided, ejecting A (save its moons Mars, the Moon, Pluto, and the other dwarf planets) out of the Solar System and shattering B to form the ...
From the total of 5,086 stars known to have exoplanets (as of January 26, 2024), there are a total of 1,033 known multiplanetary systems, [1] or stars with at least two confirmed planets, beyond the Solar System. This list includes systems with at least three confirmed planets or two confirmed planets where additional candidates have been proposed.
[3] [16] [33] [46] Another variation on the rogue planet motif involves planets in the Solar System leaving their orbit around the Sun and becoming rogue planets drifting through space, as happens to the Earth by chance in Fritz Leiber's 1951 short story "A Pail of Air" and by design in Liu Cixin's 2000 short story "The Wandering Earth" and its ...
Nemesis is a hypothetical red dwarf [1] or brown dwarf, [2] originally postulated in 1984 [3] to be orbiting the Sun at a distance of about 95,000 AU (1.5 light-years), [2] somewhat beyond the Oort cloud, to explain a perceived cycle of mass extinctions in the geological record, which seem to occur more often at intervals of 26 million years.
In 2016, the International Astronomical Union (IAU) organized a Working Group on Star Names (WGSN) [2] to catalog and standardize proper names for stars. The WGSN's first bulletin, dated July 2016, [3] included a table of 125 stars comprising the first two batches of names approved by the WGSN (on 30 June and 20 July 2016) together with names of stars adopted by the IAU Executive Committee ...
A planet that directly orbits a black hole. 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
Schematic diagram of the orbits in a binary star system. One planet is in a P-type, or circumbinary, orbit around both stars. Another planet is in an S-type, or circumstellar, orbit around only one of the two stars. Circumbinary planets are sometimes nicknamed "Tatooine worlds" after the Star Wars planet. [17]