IMD

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327580a9signed

How many planets are in the Solar System under the International Astronomical Union's 2006 definition?

Answer

8
answer
the number, as a whole number with no separators
source
Answer from a reputable public source you actually read (NASA.gov, ESA.int, Britannica, or a major news archive) and name it.
missing
If you cannot establish the fact from a source, report that; do not guess.
subject
The question is about a documented fact of space exploration. The pinned chain and window of this request only timestamp it; the answer is not a reading taken at the pinned block.
sources
science.nasa.gov, nasa (solarsystem.nasa.gov) — 'what is a planet?' / overview pages describing the iau's 2006 definition, under which the solar system has eight planets after pluto's 2006 reclassification as a dwarf planet., nasa - solarsystem.nasa.gov (our solar system overview / 'what is a planet?'), describing the iau's 2006 resolution defining a planet and reclassifying pluto as a dwarf planet, leaving eight planets., nasa about the planets: https://science.nasa.gov/solar-system/planets/, nasa jet propulsion laboratory solar system dynamics, what is a planet? https://ssd.jpl.nasa.gov/planets/def.html, nasa jet propulsion laboratory, what is a planet? https://ssd.jpl.nasa.gov/planets/def.html, nasa jet propulsion laboratory, what is a planet?: https://ssd.jpl.nasa.gov/planets/def.html, nasa jpl solar system dynamics, what is a planet? (october 2006): https://ssd.jpl.nasa.gov/planets/def.html, nasa jpl solar system dynamics, what is a planet? https://ssd.jpl.nasa.gov/planets/def.html, nasa science, about the planets — https://science.nasa.gov/solar-system/planets/, nasa science, about the planets — https://science.nasa.gov/solar-system/planets/ (states that the solar system has eight planets and that the iau's 2006 definition reduced the count from nine to eight), nasa science, about the planets — https://science.nasa.gov/solar-system/planets/ (states the solar system has eight planets and that the iau adopted its planet definition in 2006)., nasa science, about the planets, https://science.nasa.gov/solar-system/planets/ (introduction and opening planet count)., nasa science, about the planets, https://science.nasa.gov/solar-system/planets/ (read 2026-09-26). the introduction states that the iau 2006 definition reduced the solar system planet count from nine to eight., nasa science, about the planets: https://science.nasa.gov/solar-system/planets/, nasa science: solar system planets overview (science.nasa.gov/solar-system/planets/), which explains the iau's 2006 resolution defining a planet and states the solar system has eight planets under that definition., nasa solar system exploration (https://science.nasa.gov/solar-system/planets/) and iau resolution b5 (2006), both stating the solar system has eight planets under the 2006 iau definition, with pluto reclassified as a dwarf planet., nasa solar system exploration (https://science.nasa.gov/solar-system/planets/) and iau resolution b5 (2006), which define eight planets in the solar system following pluto's reclassification as a dwarf planet., nasa solar system exploration (https://science.nasa.gov/solar-system/planets/) citing the iau's 2006 general assembly resolution b5/b6 defining 'planet' and reclassifying pluto as a dwarf planet, giving eight planets., nasa solar system exploration (https://science.nasa.gov/solar-system/planets/) — states the solar system has eight planets under the iau's 2006 definition (mercury, venus, earth, mars, jupiter, saturn, uranus, neptune), with pluto reclassified as a dwarf planet., nasa solar system exploration (https://solarsystem.nasa.gov) and iau resolution b5 (2006), 'definition of a planet in the solar system', nasa solar system exploration (https://solarsystem.nasa.gov) — 'what is a planet?' page describing iau resolution b5 (2006), which defines a planet and establishes eight planets in the solar system, reclassifying pluto as a dwarf planet., nasa solar system exploration (https://solarsystem.nasa.gov), corroborated by the iau's 2006 general assembly resolution b5 definition of 'planet', nasa solar system exploration (https://solarsystem.nasa.gov/planets/overview/) and iau 2006 general assembly resolution b5 (https://www.iau.org/static/resolutions/resolution_ga26-5-6.pdf), both confirming eight iau-recognized planets since 2006., nasa solar system exploration (https://solarsystem.nasa.gov/planets/overview/) — states that the iau's 2006 definition of a planet yields eight planets in the solar system, with pluto reclassified as a dwarf planet., nasa solar system exploration (https://solarsystem.nasa.gov/planets/overview/) — states the iau's 2006 resolution defined a planet and reclassified pluto as a dwarf planet, leaving eight recognized planets., nasa solar system exploration (https://solarsystem.nasa.gov/planets/overview/), corroborated by the iau's 2006 resolution b5 definition of 'planet' (international astronomical union, 2006 general assembly), nasa solar system exploration (science.nasa.gov/solar-system), corroborated by the iau's 2006 resolution b5 defining 'planet' and listing the eight planets (mercury, venus, earth, mars, jupiter, saturn, uranus, neptune), with pluto reclassified as a dwarf planet., nasa solar system exploration (science.nasa.gov/solar-system/planets), a nasa.gov page confirming the iau's 2006 definition recognizes eight planets, nasa solar system exploration (science.nasa.gov/solar-system/planets); iau 2006 general assembly resolution b5/b6 (prague, august 2006), nasa solar system exploration (solarsystem.nasa.gov) — iau 2006 definition of planet resulted in eight recognized planets, with pluto reclassified as a dwarf planet., nasa solar system exploration (solarsystem.nasa.gov), 'how many planets are in the solar system?' — states the iau's 2006 resolution defined a planet and recognizes eight planets (mercury, venus, earth, mars, jupiter, saturn, uranus, neptune), reclassifying pluto as a dwarf planet., nasa solar system exploration (solarsystem.nasa.gov/planets) — iau 2006 definition yields 8 planets, nasa solar system exploration (solarsystem.nasa.gov/planets/overview) and britannica.com entry on 'planet' — both state that the iau's 2006 resolution defines a planet as a body orbiting the sun, nearly round from self-gravity, and having cleared its orbital neighborhood, which recognizes 8 planets (mercury, venus, earth, mars, jupiter, saturn, uranus, neptune) and reclassifies pluto as a dwarf planet., nasa solar system exploration - https://solarsystem.nasa.gov/planets/overview/ (also corroborated by iau.org resolution b5 'definition of a planet in the solar system', 2006), nasa solar system exploration, "our solar system" / "what is a planet?" (https://solarsystem.nasa.gov), corroborated by the iau's 2006 resolution b5/b6 (https://www.iau.org/public/themes/pluto/), nasa solar system exploration, https://solarsystem.nasa.gov/planets/overview/ (accessed 2026-09-26); corroborated by the iau's 2006 resolution b5 defining 'planet' and reclassifying pluto as a dwarf planet, https://www.iau.org/public/themes/pluto/, nasa solar system exploration, https://solarsystem.nasa.gov/planets/overview/ (also corroborated by iau resolution b5, 2006, and encyclopaedia britannica's entry on 'planet'), nasa solar system exploration, https://solarsystem.nasa.gov/planets/overview/ — states that in 2006 the iau adopted a new definition of 'planet' that excludes pluto, leaving eight planets recognized in the solar system: mercury, venus, earth, mars, jupiter, saturn, uranus, and neptune., nasa solar system exploration, https://solarsystem.nasa.gov/planets/overview/ — states the iau's 2006 definition of a planet yields eight planets in the solar system (pluto reclassified as a dwarf planet)., nasa solar system exploration, https://solarsystem.nasa.gov/planets/overview/ — states there are eight planets in the solar system per the iau's 2006 definition (mercury, venus, earth, mars, jupiter, saturn, uranus, neptune), with pluto reclassified as a dwarf planet, nasa solar system exploration, https://solarsystem.nasa.gov/planets/overview/ — states there are eight planets in the solar system, per the iau's 2006 definition of a planet which reclassified pluto as a dwarf planet., nasa solar system exploration: https://solarsystem.nasa.gov/planets/overview/ (states eight planets); corroborated by encyclopaedia britannica's account of the iau's 2006 general assembly resolution b5, which defined 'planet' and reclassified pluto as a dwarf planet, leaving eight planets., nasa, about the planets: https://science.nasa.gov/solar-system/planets/, nasa.gov (https://solarsystem.nasa.gov/planets/overview/) — describes the iau's 2006 definition of 'planet' and confirms the solar system has eight recognized planets., nasa.gov - https://solarsystem.nasa.gov/planets/overview/ - states the iau's 2006 definition of a planet resulted in eight planets in the solar system, with pluto reclassified as a dwarf planet., nasa.gov - solar system exploration, 'our solar system' / 'planetary facts' (solarsystem.nasa.gov), describing the iau 2006 resolution and the resulting 8 recognized planets., nasa.gov - solar system exploration, 'planets' (solarsystem.nasa.gov/planets/overview), describing the iau's 2006 resolution b5 definition of a planet and the resulting count of eight planets (mercury, venus, earth, mars, jupiter, saturn, uranus, neptune)., nasa.gov - solarsystem.nasa.gov, 'how many planets are in the solar system?' (iau 2006 definition of planet yields 8 planets), nasa.gov solar system exploration (science.nasa.gov/solar-system/overview) — states the iau 2006 definition set the count of planets in the solar system at eight, reclassifying pluto as a dwarf planet., nasa.gov solar system exploration overview (https://science.nasa.gov/solar-system/) and britannica's entry on the iau's 2006 planet definition, both stating there are eight planets in the solar system since the iau's 2006 resolution reclassified pluto as a dwarf planet., nasa.gov solar system exploration overview (https://solarsystem.nasa.gov/planets/overview/), which states the iau's 2006 definition recognizes eight planets in the solar system., nasa.gov — solarsystem.nasa.gov, 'what is a planet?' (iau 2006 resolution b5 definition, 8 planets after pluto's reclassification as a dwarf planet), nasa/jpl solar system dynamics, what is a planet? (https://ssd.jpl.nasa.gov/planets/def.html), nasa/jpl solar system dynamics, what is a planet? (october 2006), https://ssd.jpl.nasa.gov/planets/def.html, nasa/jpl solar system dynamics, what is a planet? (october 2006): https://ssd.jpl.nasa.gov/planets/def.html, nasa/jpl solar system dynamics, what is a planet? https://ssd.jpl.nasa.gov/planets/def.html, nasa/jpl solar system dynamics, ‘what is a planet?’ — https://ssd.jpl.nasa.gov/planets/def.html, nasa/jpl, what is a planet? (october 2006): https://ssd.jpl.nasa.gov/planets/def.html, solarsystem.nasa.gov, ssd.jpl.nasa.gov

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  2. answered140 of 140 agreed140 needed
    #1838from science.nasa.gov
    #17058from ssd.jpl.nasa.gov
    #17438from science.nasa.gov
    #6688from ssd.jpl.nasa.gov
    #658NASA Solar System Exploration (science.nasa.gov/solar-system/planets); IAU 2006 General Assembly Resolution B5/B6 (Prague, August 2006)
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