Matches in DBpedia 2016-04 for { <http://dbpedia.org/resource/Planets_beyond_Neptune> ?p ?o }
- 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 giant planets, 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 named the ninth planet. In 1978, Pluto was conclusively determined to be too small for its gravity to affect the giant planets, 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 Neptune the farthest known planet in the Solar System.While today the astronomical community widely agrees that Planet X, as originally envisioned, does not exist, the concept of an as yet unobserved planet has been revived by a number of astronomers to explain other anomalies observed in the outer Solar System. As of March 2014, observations with the WISE telescope have ruled out the possibility of a Saturn-sized object (95 Earth mass) out to 10,000 AU, and a Jupiter-sized or larger object out to 26,000 AU.In 2014, based on similarities of the orbits of a group of recently discovered extreme trans-Neptunian objects, astronomers hypothesized the existence of a super-Earth planet, 2 to 15 times the mass of the Earth and beyond 200 AU with possibly a high inclined orbit at some 1500 AU. In 2016 further work showed this unknown distant planet is likely on an inclined, eccentric orbit that goes no closer than about 200 AU and no further than about 1600 AU from the Sun. The orbit is predicted to be anti-aligned to the clustered extreme trans-Neptunian objects.Because Pluto is no longer considered a planet by the International Astronomical Union, this new hypothetical object has become known as Planet Nine.".
- Planets_beyond_Neptune thumbnail Percival_Lowell_observing_Venus_from_the_Lowell_Observatory_in_1914.jpg?width=300.
- Planets_beyond_Neptune wikiPageExternalLink claims-about-new-planets-that-turned-out-to-be-wrong-and-why-planet-nine-may-be-different-53573.
- Planets_beyond_Neptune wikiPageExternalLink planetx.
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- Planets_beyond_Neptune wikiPageRevisionID "708430146".
- Planets_beyond_Neptune wikiPageWikiLink Barnard.
- Planets_beyond_Neptune wikiPageWikiLink 90377_Sedna.
- Planets_beyond_Neptune wikiPageWikiLink ALMA_(radio_telescope_array).
- Planets_beyond_Neptune wikiPageWikiLink Abbott_Lawrence_Lowell.
- Planets_beyond_Neptune wikiPageWikiLink Alan_Stern.
- Planets_beyond_Neptune wikiPageWikiLink Albedo.
- Planets_beyond_Neptune wikiPageWikiLink Alexis_Bouvard.
- Planets_beyond_Neptune wikiPageWikiLink Apparent_magnitude.
- Planets_beyond_Neptune wikiPageWikiLink Apparent_retrograde_motion.
- Planets_beyond_Neptune wikiPageWikiLink Apsis.
- Planets_beyond_Neptune wikiPageWikiLink Arequipa.
- Planets_beyond_Neptune wikiPageWikiLink Argument_of_periapsis.
- Planets_beyond_Neptune wikiPageWikiLink Armin_Otto_Leuschner.
- Planets_beyond_Neptune wikiPageWikiLink Asteroid.
- Planets_beyond_Neptune wikiPageWikiLink Astronomical_unit.
- Planets_beyond_Neptune wikiPageWikiLink Blink_comparator.
- Planets_beyond_Neptune wikiPageWikiLink Brahma.
- Planets_beyond_Neptune wikiPageWikiLink Brian_G._Marsden.
- Planets_beyond_Neptune wikiPageWikiLink Camille_Flammarion.
- Planets_beyond_Neptune wikiPageWikiLink Cartesian_coordinate_system.
- Planets_beyond_Neptune wikiPageWikiLink Cassini–Huygens.
- Planets_beyond_Neptune wikiPageWikiLink Category:Astronomical_controversies.
- Planets_beyond_Neptune wikiPageWikiLink Category:Hypothetical_bodies_of_the_Solar_System.
- Planets_beyond_Neptune wikiPageWikiLink Category:Hypothetical_planets.
- Planets_beyond_Neptune wikiPageWikiLink Category:Hypothetical_trans-Neptunian_objects.
- Planets_beyond_Neptune wikiPageWikiLink Category:Obsolete_scientific_theories.
- Planets_beyond_Neptune wikiPageWikiLink Category:Plutos_planethood.
- Planets_beyond_Neptune wikiPageWikiLink Category:Solar_System_dynamic_theories.
- Planets_beyond_Neptune wikiPageWikiLink Category:Trans-Neptunian_objects.
- Planets_beyond_Neptune wikiPageWikiLink Chad_Trujillo.
- Planets_beyond_Neptune wikiPageWikiLink Charon_(moon).
- Planets_beyond_Neptune wikiPageWikiLink Classical_mechanics.
- Planets_beyond_Neptune wikiPageWikiLink Clearing_the_neighbourhood.
- Planets_beyond_Neptune wikiPageWikiLink Clyde_Tombaugh.
- Planets_beyond_Neptune wikiPageWikiLink Comet.
- Planets_beyond_Neptune wikiPageWikiLink Comet_Swift–Tuttle.
- Planets_beyond_Neptune wikiPageWikiLink Complutense_University_of_Madrid.
- Planets_beyond_Neptune wikiPageWikiLink David_Peck_Todd.
- Planets_beyond_Neptune wikiPageWikiLink Detached_object.
- Planets_beyond_Neptune wikiPageWikiLink Discovery_of_Neptune.
- Planets_beyond_Neptune wikiPageWikiLink Dwarf_planet.
- Planets_beyond_Neptune wikiPageWikiLink E._C._Bower.
- Planets_beyond_Neptune wikiPageWikiLink E._Myles_Standish.
- Planets_beyond_Neptune wikiPageWikiLink Earth.
- Planets_beyond_Neptune wikiPageWikiLink Ecliptic.
- Planets_beyond_Neptune wikiPageWikiLink Ernest_William_Brown.
- Planets_beyond_Neptune wikiPageWikiLink Europa_(moon).
- Planets_beyond_Neptune wikiPageWikiLink Fictional_planets_of_the_Solar_System.
- Planets_beyond_Neptune wikiPageWikiLink File:Percival_Lowell_observing_Venus_from_the_Lowell_Observatory_in_1914.jpg.
- Planets_beyond_Neptune wikiPageWikiLink File:Pluto_discovery_plates.png.
- Planets_beyond_Neptune wikiPageWikiLink Flagstaff,_Arizona.
- Planets_beyond_Neptune wikiPageWikiLink Galactic_tide.
- Planets_beyond_Neptune wikiPageWikiLink Galilean_moons.
- Planets_beyond_Neptune wikiPageWikiLink Ganymede_(moon).
- Planets_beyond_Neptune wikiPageWikiLink Gas_giant.
- Planets_beyond_Neptune wikiPageWikiLink George_Biddell_Airy.
- Planets_beyond_Neptune wikiPageWikiLink Gerard_Kuiper.
- Planets_beyond_Neptune wikiPageWikiLink Giant_planet.
- Planets_beyond_Neptune wikiPageWikiLink Gná_and_Hófvarpnir.
- Planets_beyond_Neptune wikiPageWikiLink Gotha.
- Planets_beyond_Neptune wikiPageWikiLink Gotha_Observatory.
- Planets_beyond_Neptune wikiPageWikiLink Halleys_Comet.
- Planets_beyond_Neptune wikiPageWikiLink Hamilton_College_(New_York).
- Planets_beyond_Neptune wikiPageWikiLink Hans_E._Lau.
- Planets_beyond_Neptune wikiPageWikiLink Harlow_Shapley.
- Planets_beyond_Neptune wikiPageWikiLink Harvard_College_Observatory.
- Planets_beyond_Neptune wikiPageWikiLink Heinrich_Louis_dArrest.
- Planets_beyond_Neptune wikiPageWikiLink IAU_definition_of_planet.
- Planets_beyond_Neptune wikiPageWikiLink IRAS.
- Planets_beyond_Neptune wikiPageWikiLink Infrared_cirrus.
- Planets_beyond_Neptune wikiPageWikiLink International_Astronomical_Union.
- Planets_beyond_Neptune wikiPageWikiLink Io_(moon).
- Planets_beyond_Neptune wikiPageWikiLink Jacques_Babinet.
- Planets_beyond_Neptune wikiPageWikiLink James_Ferguson_(American_astronomer).
- Planets_beyond_Neptune wikiPageWikiLink James_W._Christy.
- Planets_beyond_Neptune wikiPageWikiLink Jet_Propulsion_Laboratory.
- Planets_beyond_Neptune wikiPageWikiLink Jet_Propulsion_Laboratory_Development_Ephemeris.
- Planets_beyond_Neptune wikiPageWikiLink Johann_Gottfried_Galle.
- Planets_beyond_Neptune wikiPageWikiLink Jupiter.
- Planets_beyond_Neptune wikiPageWikiLink Kobe_University.
- Planets_beyond_Neptune wikiPageWikiLink Konstantin_Batygin.
- Planets_beyond_Neptune wikiPageWikiLink Kuiper_belt.
- Planets_beyond_Neptune wikiPageWikiLink Large_Synoptic_Survey_Telescope.
- Planets_beyond_Neptune wikiPageWikiLink Lawrence_Livermore_National_Laboratory.
- Planets_beyond_Neptune wikiPageWikiLink List_of_hypothetical_Solar_System_objects.
- Planets_beyond_Neptune wikiPageWikiLink Lloyd_R._Wylie.
- Planets_beyond_Neptune wikiPageWikiLink Lowell_Observatory.
- Planets_beyond_Neptune wikiPageWikiLink Madrid.
- Planets_beyond_Neptune wikiPageWikiLink Mars.
- Planets_beyond_Neptune wikiPageWikiLink Martian_canal.
- Planets_beyond_Neptune wikiPageWikiLink Mercury_(planet).
- Planets_beyond_Neptune wikiPageWikiLink Methane.