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From Middle English planete, from Old French planete, from Latin planeta, planetes, from Ancient Greek πλανήτης (planḗtēs, “wanderer”) (ellipsis of ), from Ancient Greek πλανάω (planáō, “wander about, stray”), of unknown origin. Cognate with Latin pālor (“wander about, stray”), Old Norse flana (“to rush about”), and Norwegian flanta (“to wander about”). More at flaunt.
- (now historical or astrology) Each of the seven major bodies which move relative to the fixed stars in the night sky—the Moon, Mercury, Venus, the Sun, Mars, Jupiter and Saturn. [from 14thc.]
- (astronomy) A body which orbits a star (または star cluster), is massive enough to be in hydrostatic equilibrium (generally meaning a spheroid) but not enough to attain nuclear fusion and, in IAU usage, dominates the region of its orbit about the star; specifically, in the case of the Solar system, the eight major bodies of Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune. (Pluto was considered a planet until it was reclassified as a dwarf planet by the IAU in 2006.) [from 17thc.]
- Found in phrases such as the planet, this planet to refer to the Earth.
- 1907 August, Robert W[illiam] Chambers, chapter VIII, in The Younger Set, New York, N.Y.: D. Appleton & Company, OCLC 24962326:
- "My tastes," he said, still smiling, "incline me to the garishly sunlit side of this planet." And, to tease her and arouse her to combat: "I prefer a farandole to a nocturne; I'd rather have a painting than an etching; Mr. Whistler bores me with his monochromatic mud; I don't like dull colours, dull sounds, dull intellects; […]."
- 2013 June 7, David Simpson, “Fantasy of navigation”, in The Guardian Weekly, volume 188, number 26, page 36:
The term planet originally meant any star which wandered across the sky, and generally included comets and the Sun and Moon. With the Copernican revolution, the Earth was recognized as a planet, and the Sun was seen to be fundamentally different. The Galileian satellites of Jupiter were at first called planets (satellite planets), but later reclassified along with the Moon. The first asteroids were also considered to be planets, but were reclassified when it was realized that there were a great many of them, crossing each other's orbits, in a zone where only a single planet had been expected. Likewise, Pluto was found where an outer planet had been expected, but doubts were raised when it turned out to cross Neptune's orbit and to be much smaller than the expectation required. When Eris, an outer body more massive than Pluto, was discovered, the International Astronomical Union (IAU) officially defined the word planet as above. However, a significant number have refused to accept the IAU definition, especially in the field of planetary geology. Some simply continue with the nine planets that had been recognized prior to the discovery of Eris. Others are of the opinion that orbital parameters should be irrelevant, and that either any equilibrium (ellipsoidal) body in direct orbit around a star is a planet (there are likely at least a dozen such bodies in the Solar system) or that any equilibrium body at all is a planet, thus re-accepting the Moon, the Galileian satellites and other large moons as planets.
- binary planet
- Blue Planet
- carbide planet
- carbon planet
- classical planet
- diamond planet
- double planet
- dual planet
- dwarf planet (structurally)
- extrasolar planet
- free-floating planet
- giant planet
- hycean planet
- inferior planet
- inner planet
- interstellar planet
- major planet
- minor planet (structurally)
- outer planet
- Planet Earth
- primary planet
- Red Planet
- rogue planet
- satellite planet
- satellite planet
- silicate planet
- silicon planet
- supergiant planet
- superior planet
- terrestrial planet
- water planet
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