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- Definition_of_planet abstract "The definition of planet, since the word was coined by the ancient Greeks, has included within its scope a wide range of celestial bodies. Greek astronomers employed the term asteres planetai (ἀστέρες πλανῆται), "wandering stars", for objects which apparently move over the sky. Over the millennia, the term has included a variety of different objects, from the Sun and the Moon to satellites and asteroids.By the end of the 19th century the word planet, though it had yet to be defined, had become a working term applied only to a small set of objects in the Solar System. After 1992, however, astronomers began to discover many additional objects beyond the orbit of Neptune, as well as hundreds of objects orbiting other stars. These discoveries not only increased the number of potential planets, but also expanded their variety and peculiarity. Some were nearly large enough to be stars, while others were smaller than Earth's moon. These discoveries challenged long-perceived notions of what a planet could be.The issue of a clear definition for planet came to a head in 2005 with the discovery of the trans-Neptunian object Eris, a body larger than the smallest then-accepted planet, Pluto. In its 2006 response, the International Astronomical Union (IAU), recognised by astronomers as the world body responsible for resolving issues of nomenclature, released its decision on the matter. This definition, which applies only to the Solar System, states that a planet is a body that orbits the Sun, is massive enough for its own gravity to make it round, and has "cleared its neighbourhood" of smaller objects around its orbit. Under this new definition, Pluto and the other trans-Neptunian objects do not qualify as planets. The IAU's decision has not resolved all controversies, and while many scientists have accepted the definition, some in the astronomical community have rejected it outright.".
- Definition_of_planet thumbnail Voyager_2_Neptune_and_Triton.jpg?width=300.
- Definition_of_planet wikiPageExternalLink pluto.
- Definition_of_planet wikiPageExternalLink PlutoQuestion.html.
- Definition_of_planet wikiPageExternalLink Planeten_Definition_Resolution_5_6_7.html.
- Definition_of_planet wikiPageExternalLink 4798205.stm.
- Definition_of_planet wikiPageExternalLink 2123839.
- Definition_of_planet wikiPageExternalLink media-stream-archive.php.
- Definition_of_planet wikiPageExternalLink ICQPluto.html.
- Definition_of_planet wikiPageExternalLink A0776605.html?mail-07-29.
- Definition_of_planet wikiPageExternalLink story.php?storyId=5723794.
- Definition_of_planet wikiPageExternalLink article.cfm?chanID=sa006&articleID=93385350-E7F2-99DF-3FD6272BB4959038&pageNumber=2&catID=2.
- Definition_of_planet wikiPageExternalLink 061121_exoplanet_definition.html.
- Definition_of_planet wikiPageExternalLink planet_confusion_001101-2.html.
- Definition_of_planet wikiPageExternalLink pluto.html.
- Definition_of_planet wikiPageExternalLink 0607184.
- Definition_of_planet wikiPageID "899973".
- Definition_of_planet wikiPageRevisionID "606735708".
- Definition_of_planet hasPhotoCollection Definition_of_planet.
- Definition_of_planet subject Category:Astronomical_controversies.
- Definition_of_planet subject Category:Definition_of_planet.
- Definition_of_planet subject Category:Definitions.
- Definition_of_planet subject Category:History_of_astronomy.
- Definition_of_planet subject Category:Planetary_science.
- Definition_of_planet subject Category:Planets.
- Definition_of_planet subject Category:Planets_of_the_Solar_System.
- Definition_of_planet type CelestialBody109239740.
- Definition_of_planet type NaturalObject100019128.
- Definition_of_planet type Object100002684.
- Definition_of_planet type PhysicalEntity100001930.
- Definition_of_planet type Planet109394007.
- Definition_of_planet type Planets.
- Definition_of_planet type PlanetsOfTheSolarSystem.
- Definition_of_planet type Whole100003553.
- Definition_of_planet comment "The definition of planet, since the word was coined by the ancient Greeks, has included within its scope a wide range of celestial bodies. Greek astronomers employed the term asteres planetai (ἀστέρες πλανῆται), "wandering stars", for objects which apparently move over the sky.".
- Definition_of_planet label "Definición de planeta".
- Definition_of_planet label "Definition of planet".
- Definition_of_planet label "Definizione di pianeta".
- Definition_of_planet label "Definição de planeta".
- Definition_of_planet label "Définition des planètes".
- Definition_of_planet label "Определение планеты".
- Definition_of_planet label "تعريف الكوكب".
- Definition_of_planet label "惑星の定義".
- Definition_of_planet label "行星定義".
- Definition_of_planet sameAs Ορισμός_του_πλανήτη.
- Definition_of_planet sameAs Definición_de_planeta.
- Definition_of_planet sameAs Définition_des_planètes.
- Definition_of_planet sameAs Definizione_di_pianeta.
- Definition_of_planet sameAs 惑星の定義.
- Definition_of_planet sameAs 행성의_정의.
- Definition_of_planet sameAs Definição_de_planeta.
- Definition_of_planet sameAs Q16743.
- Definition_of_planet sameAs Q16743.
- Definition_of_planet sameAs Definition_of_planet.
- Definition_of_planet wasDerivedFrom Definition_of_planet?oldid=606735708.
- Definition_of_planet depiction Voyager_2_Neptune_and_Triton.jpg.
- Definition_of_planet isPrimaryTopicOf Definition_of_planet.