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- Planets_beyond_Neptune abstract "Following the discovery of the planet Neptune in 1846, there was considerable speculation that another planet might exist beyond its orbit. The search began in the mid-19th century and culminated at the start of the 20th with Percival Lowell's quest for Planet X. Lowell proposed the Planet X hypothesis to explain apparent discrepancies in the orbits of the gas giants, particularly Uranus and Neptune, speculating that the gravity of a large unseen ninth planet could have perturbed Uranus enough to account for the irregularities.Clyde Tombaugh's discovery of Pluto in 1930 appeared to validate Lowell's hypothesis, and Pluto was officially considered the ninth planet until 2006. In 1978, Pluto was found to be too small for its gravity to affect the gas giants, resulting in a brief search for a tenth planet. The search was largely abandoned in the early 1990s, when a study of measurements made by the Voyager 2 spacecraft found that the irregularities observed in Uranus's orbit were due to a slight overestimation of Neptune's mass. After 1992, the discovery of numerous small icy objects with similar or even wider orbits than Pluto led to a debate over whether Pluto should remain a planet, or whether it and its neighbours should, like the asteroids, be given their own separate classification. Although a number of the larger members of this group were initially described as planets, in 2006 the International Astronomical Union reclassified Pluto and its largest neighbours as dwarf planets, leaving only eight planets in the Solar System.Today, the astronomical community widely agrees that Planet X, as originally envisioned, does not exist, but the concept of Planet X has been revived by a number of astronomers to explain other anomalies observed in the outer Solar System. In popular culture, and even among some astronomers, Planet X has become a stand-in term for any undiscovered planet in the outer Solar System, regardless of its relationship to Lowell's hypothesis. Other trans-Neptunian planets have also been suggested, based on different evidence.On 7 March 2014, NASA reported that the WISE telescope had ruled out the possibility of a Saturn-sized object out to 10,000 AU, and a Jupiter-sized or larger object out to 26,000 AU.".
- Planets_beyond_Neptune thumbnail Percival_Lowell_observing_Venus_from_the_Lowell_Observatory_in_1914.jpg?width=300.
- Planets_beyond_Neptune wikiPageExternalLink planetx.
- Planets_beyond_Neptune wikiPageID "23842".
- Planets_beyond_Neptune wikiPageRevisionID "606388061".
- Planets_beyond_Neptune hasPhotoCollection Planets_beyond_Neptune.
- Planets_beyond_Neptune subject Category:Astronomical_controversies.
- Planets_beyond_Neptune subject Category:Hypothetical_bodies_of_the_Solar_System.
- Planets_beyond_Neptune subject Category:Hypothetical_planets.
- Planets_beyond_Neptune subject Category:Hypothetical_trans-Neptunian_objects.
- Planets_beyond_Neptune subject Category:Obsolete_scientific_theories.
- Planets_beyond_Neptune subject Category:Oort_cloud.
- Planets_beyond_Neptune subject Category:Pluto's_planethood.
- Planets_beyond_Neptune subject Category:Solar_System_dynamic_theories.
- Planets_beyond_Neptune subject Category:Trans-Neptunian_objects.
- Planets_beyond_Neptune type Body105216365.
- Planets_beyond_Neptune type CelestialBody109239740.
- Planets_beyond_Neptune type HypotheticalBodiesOfTheSolarSystem.
- Planets_beyond_Neptune type HypotheticalPlanets.
- Planets_beyond_Neptune type NaturalObject100019128.
- Planets_beyond_Neptune type Object100002684.
- Planets_beyond_Neptune type PhysicalEntity100001930.
- Planets_beyond_Neptune type Planet109394007.
- Planets_beyond_Neptune type Trans-NeptunianObjects.
- Planets_beyond_Neptune type Whole100003553.
- Planets_beyond_Neptune type Agent.
- Planets_beyond_Neptune type Company.
- Planets_beyond_Neptune type Organisation.
- Planets_beyond_Neptune type RecordLabel.
- Planets_beyond_Neptune type Organization.
- Planets_beyond_Neptune type Agent.
- Planets_beyond_Neptune type SocialPerson.
- Planets_beyond_Neptune type Thing.
- Planets_beyond_Neptune comment "Following the discovery of the planet Neptune in 1846, there was considerable speculation that another planet might exist beyond its orbit. The search began in the mid-19th century and culminated at the start of the 20th with Percival Lowell's quest for Planet X.".
- Planets_beyond_Neptune label "Planets beyond Neptune".
- Planets_beyond_Neptune label "Planètes au-delà de Neptune".
- Planets_beyond_Neptune label "كواكب ما بعد نبتون".
- Planets_beyond_Neptune label "假設的海王星外天體".
- Planets_beyond_Neptune sameAs Planètes_au-delà_de_Neptune.
- Planets_beyond_Neptune sameAs m.05yvg.
- Planets_beyond_Neptune sameAs Q2803875.
- Planets_beyond_Neptune sameAs Q2803875.
- Planets_beyond_Neptune sameAs Planets_beyond_Neptune.
- Planets_beyond_Neptune wasDerivedFrom Planets_beyond_Neptune?oldid=606388061.
- Planets_beyond_Neptune depiction Percival_Lowell_observing_Venus_from_the_Lowell_Observatory_in_1914.jpg.
- Planets_beyond_Neptune isPrimaryTopicOf Planets_beyond_Neptune.