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How many planets are in the Solar System under the IAU'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 (Britannica, an official government, agency or company site, or a major reference work) 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 history, science, civics or technology. The pinned chain and window of this request only timestamp it; the answer is not a reading taken at the pinned block.
sources
ssd.jpl.nasa.gov, britannica, solar system / iau 2006 definition of planet (https://www.britannica.com/place/solar-system), en.wikipedia.org, encyclopaedia britannica, encyclopaedia britannica ("planet" / "dwarf planet" articles) and the international astronomical union's 2006 general assembly resolution b5, which defines a "planet" and states that under this definition the solar system has eight planets, with pluto reclassified as a dwarf planet, encyclopaedia britannica (britannica.com), entries on "planet" and the iau's 2006 planet definition, confirming eight iau-recognized planets (mercury through neptune) after pluto's 2006 reclassification as a dwarf planet., encyclopaedia britannica, "iau 2006 general assembly: result of the iau resolution votes" / britannica article on the definition of planet, confirming the 2006 iau general assembly definition yields eight planets in the solar system, with pluto reclassified as a dwarf planet., encyclopaedia britannica, 'planet' (britannica.com), corroborated by the international astronomical union's 2006 general assembly resolution b5 'definition of a planet in the solar system', which formally establishes eight planets and reclassifies pluto as a dwarf planet., iau (iau.org) resolution b5 (2006) 'definition of a planet in the solar system'; corroborated by encyclopaedia britannica, 'planet'., iau (international astronomical union) resolution b5, 'definition of a planet in the solar system', adopted at the iau general assembly, prague, 24 august 2006, iau (international astronomical union), resolution b5 "definition of a planet in the solar system" (2006); confirmed by nasa solar system exploration (solarsystem.nasa.gov) which states there are eight planets under this definition., iau 2006 resolution b5/b6 as summarized on wikipedia 'iau definition of planet' (eight planets: mercury, venus, earth, mars, jupiter, saturn, uranus, neptune), iau resolution b5 (2006) via iau.org, corroborated by encyclopaedia britannica's "planet" article — both state the solar system has eight planets under the 2006 iau definition., iau resolution b5 (2006), 'definition of a planet in the solar system' (iau.org); corroborated by encyclopaedia britannica's 'planet' entry., iau resolution b5 (2006), 'definition of a planet in the solar system' (iau.org); corroborated by encyclopaedia britannica, 'planet' article, iau resolution b5 (2006), 'definition of a planet in the solar system', https://www.iau.org/static/resolutions/resolution_ga26-5-6.pdf; corroborated by encyclopaedia britannica, 'planet', iau resolution b5 (2006), 'definition of a planet in the solar system', https://www.iau.org/static/resolutions/resolution_ga26-5-6.pdf; corroborated by encyclopaedia britannica, 'planet' (britannica.com), iau resolution b5 (2006), 'definition of a planet in the solar system', https://www.iau.org/static/resolutions/resolution_ga26-5-6.pdf; corroborated by encyclopaedia britannica, 'planet' article, iau resolution b5 (2006), https://www.iau.org/static/resolutions/resolution_ga26-5-6.pdf; corroborated by encyclopaedia britannica entry 'planet' (britannica.com), iau resolution b5 (2006); encyclopaedia britannica, 'planet', iau resolution b5 (https://iauarchive.eso.org/news/pressreleases/detail/iau0602/); nasa about the planets (https://science.nasa.gov/solar-system/planets/), iau resolution b5, "definition of a planet in the solar system", international astronomical union, adopted 24 august 2006, https://www.iau.org/public/themes/pluto/, iau resolution b5, iau general assembly, prague, 24 august 2006 (iau.org); encyclopaedia britannica, "planet", iau resolution b5/b6 (2006) as reported by nasa solar system exploration (https://science.nasa.gov/solar-system/planets/) and encyclopaedia britannica (https://www.britannica.com/science/planet), both stating eight planets under the 2006 iau definition., iau resolution b5/b6 (2006), iau.org; encyclopaedia britannica, 'planet', iau resolutions b5 and b6, xxvith general assembly, august 2006 (https://www.iau.org/static/resolutions/resolution_ga26-5-6.pdf), iau, resolution b5, definition of a planet in the solar system (2006): https://www.iau.org/static/resolutions/resolution_ga26-5-6.pdf, iauarchive.eso.org, international astronomical union (iau) resolution b5/b6, 2006, 'definition of a planet in the solar system', reaffirmed on the iau's official website (iau.org); consistent with nasa solar system exploration ('our solar system', solarsystem.nasa.gov) and encyclopaedia britannica ('planet' / 'solar system' entries), all of which list 8 planets (mercury, venus, earth, mars, jupiter, saturn, uranus, neptune) since pluto was reclassified as a dwarf planet under the 2006 definition., international astronomical union (iau), resolution b5 'definition of a planet in the solar system', adopted 24 august 2006 at the iau general assembly (iau.org), which establishes 8 planets (mercury, venus, earth, mars, jupiter, saturn, uranus, neptune) and reclassifies pluto as a 'dwarf planet'; corroborated by encyclopaedia britannica's entry on the 2006 iau planet definition., international astronomical union (iau), resolution b5 'definition of a planet in the solar system', adopted 24 august 2006, and the iau's public faq on the planet definition, both stating the solar system has eight planets under the 2006 definition., international astronomical union (iau), resolution b5 (2006) and iau faq on the definition of a planet: under the 2006 definition, a planet must (a) orbit the sun, (b) be in hydrostatic equilibrium (nearly round shape), and (c) have cleared its orbital neighborhood. this reclassified pluto as a 'dwarf planet', leaving eight planets: mercury, venus, earth, mars, jupiter, saturn, uranus, neptune., international astronomical union (iau), resolution b5, 2006 general assembly (iau.org), international astronomical union (iau.org), resolution b5 (2006); corroborated by encyclopaedia britannica, international astronomical union resolution b5 (2006); nasa solar system exploration, international astronomical union, 2006 resolution summary: https://www.iau.org/static/archives/releases/pdf/iau0603.pdf, international astronomical union, iau resolution b5 "definition of a planet in the solar system" (24 august 2006), www.iau.org, international astronomical union, resolution 5a / official 2006 release: https://www.iau.org/static/archives/releases/pdf/iau0603.pdf, international astronomical union, resolution b5 "definition of a planet in the solar system" (2006), as summarized by the iau (iau.org) and encyclopaedia britannica's article "planet": under the 2006 iau definition there are eight planets in the solar system (mercury, venus, earth, mars, jupiter, saturn, uranus, neptune), with pluto reclassified as a dwarf planet., international astronomical union, resolution b5 "definition of a planet in the solar system" (2006), https://www.iau.org/public/themes/pluto/, international astronomical union, resolution b5 "definition of a planet in the solar system" (adopted 24 august 2006), https://www.iau.org/static/resolutions/resolution_ga26-5-6.pdf and iau public statement "iau 2006 general assembly: result of the iau resolution votes" (iau.org/news), international astronomical union, resolution b5 "definition of a planet in the solar system" (iau 2006 general assembly, iau.org); corroborated by encyclopaedia britannica, "planet", international astronomical union, resolution b5 "definition of a planet in the solar system" and resolution b6 "pluto", adopted at the iau xxvi general assembly, prague, 24 august 2006 (https://www.iau.org/static/resolutions/resolution_ga26-5-6.pdf); corroborated by encyclopaedia britannica's entry "planet" describing the 2006 iau definition and the resulting count of eight planets., international astronomical union, resolution b5 'definition of a planet in the solar system' (2006), as summarized on the iau's official website (iau.org) and encyclopaedia britannica's article 'planet' / 'pluto', international astronomical union, resolution b5 'definition of a planet in the solar system' (2006), iau.org; corroborated by encyclopaedia britannica's entry on 'planet'., international astronomical union, resolution b5 'definition of a planet in the solar system' (2006, iau.org); corroborated by encyclopaedia britannica's entry on 'planet', international astronomical union, resolution b5 'definition of a planet in the solar system' (24 august 2006, iau.org); corroborated by encyclopaedia britannica, 'planet' article., international astronomical union, resolution b5 'definition of a planet in the solar system', iau xxvi general assembly, prague, 24 august 2006 (https://www.iau.org/static/resolutions/resolution_ga26-5-6.pdf), corroborated by the iau's public faq 'what is a planet?' (https://www.iau.org/public/themes/pluto/), international astronomical union, resolution b5 ("definition of a planet in the solar system"), adopted at the iau general assembly, prague, 2006-08-24, https://www.iau.org/static/resolutions/resolution_ga26-5-6.pdf, international astronomical union, resolution b5 (2006), "definition of a planet in the solar system", https://www.iau.org/static/resolutions/resolution_ga26-5-6.pdf, as summarized in the iau's public press materials; the eight planets are mercury, venus, earth, mars, jupiter, saturn, uranus, neptune., international astronomical union, resolution b5 (2006), "definition of a planet in the solar system"; corroborated by encyclopaedia britannica's article on the iau's 2006 planet definition., international astronomical union, resolution b5 (2006), "definition of a planet in the solar system"; corroborated by encyclopaedia britannica, "planet" / "solar system" articles., international astronomical union, resolution b5 (2006), 'definition of a planet in the solar system', https://www.iau.org/static/resolutions/resolution_ga26-5-6.pdf, international astronomical union, resolution b5 (2006), 'definition of a planet in the solar system', https://www.iau.org/static/resolutions/resolution_ga26-5-6.pdf; corroborated by encyclopaedia britannica's entry on 'planet' (britannica.com/science/planet), international astronomical union, resolution b5 (2006), and nasa solar system exploration overview, international astronomical union, resolution b5 (2006), https://www.iau.org/public/themes/pluto/ ; corroborated by encyclopaedia britannica, 'planet' entry., international astronomical union, resolution b5 (2006), https://www.iau.org/static/resolutions/resolution_ga26-5-6.pdf, international astronomical union, resolution b5 (2006), “definition of a planet in the solar system”: https://iauarchive.eso.org/static/resolutions/resolution_ga26-5-6.pdf, international astronomical union, resolution b5 (2006); corroborated by encyclopaedia britannica, international astronomical union, resolution b5 (2006); corroborated by nasa solar system exploration and encyclopaedia britannica, international astronomical union, resolution b5, 'definition of a planet in the solar system' (adopted 24 august 2006, iau general assembly, prague), https://www.iau.org/static/resolutions/resolution_ga26-5-6.pdf, international astronomical union, resolution b5: definition of a planet in the solar system (2006), https://www.iau.org/static/resolutions/resolution_ga26-5-6.pdf, international astronomical union, resolution b6 'definition of a planet in the solar system' (2006, iau.org), corroborated by encyclopaedia britannica's 'planet' article, international astronomical union, resolutions b5 and b6 (prague, 24 august 2006), https://www.iau.org/static/resolutions/resolution_ga26-5-6.pdf; encyclopaedia britannica, 'planet'., nasa jet propulsion laboratory 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/, nasa science, planets of the solar system: https://science.nasa.gov/solar-system/planets/, nasa science, solar system planets (https://science.nasa.gov/solar-system/planets/): the solar system has eight planets and five dwarf planets; consistent with the iau 2006 definition, nasa science, solar system planets: https://science.nasa.gov/solar-system/planets/, nasa solar system exploration (https://solarsystem.nasa.gov/planets/overview/) and encyclopaedia britannica, both confirming eight planets under the iau's 2006 definition, nasa solar system exploration (science.nasa.gov/solar-system/planets) and encyclopaedia britannica ('planet' article), both stating that under the iau's 2006 resolution the solar system has eight officially recognized planets: mercury, venus, earth, mars, jupiter, saturn, uranus, and neptune. pluto was reclassified as a dwarf planet by the same 2006 iau resolution., nasa solar system exploration (solarsystem.nasa.gov) and the international astronomical union (iau) resolution b5, 'definition of a planet in the solar system' (adopted 24 august 2006, iau xxvi general assembly, prague), both state that under the 2006 definition there are 8 planets: mercury, venus, earth, mars, jupiter, saturn, uranus, and neptune. pluto was reclassified as a dwarf planet., nasa solar system exploration (solarsystem.nasa.gov), citing iau resolution b5 (2006), nasa solar system exploration (solarsystem.nasa.gov, 'our solar system' overview) and encyclopaedia britannica ('planet' and 'international astronomical union' articles), both stating that the iau's 2006 resolution b5 defines a planet and recognizes eight planets in the solar system: mercury, venus, earth, mars, jupiter, saturn, uranus, and neptune (pluto was reclassified as a dwarf planet)., nasa solar system exploration (solarsystem.nasa.gov/planets) and encyclopaedia britannica, 'planet' / iau 2006 definition entry, nasa solar system exploration (solarsystem.nasa.gov/planets) and iau resolution b5 (2006), which define a planet as a body orbiting the sun that is round due to hydrostatic equilibrium and has cleared its orbital neighborhood, yielding eight planets: mercury, venus, earth, mars, jupiter, saturn, uranus, neptune., nasa solar system exploration, https://science.nasa.gov/solar-system/planets/ (states eight planets; consistent with iau 2006 resolution b5), nasa, about the planets: https://science.nasa.gov/solar-system/planets/, nasa/jpl solar system dynamics, planets and the solar system: 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), science.nasa.gov, wikipedia, iau definition of planet (citing iau 2006 resolution b5/b6): the eight planets are mercury, venus, earth, mars, jupiter, saturn, uranus, neptune, wikipedia, iau definition of planet (iau 2006 resolution b5: eight planets, mercury to neptune); consistent with iau.org and britannica, www.iau.org

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  2. answered140 of 140 agreed140 needed
    #3638International Astronomical Union, Resolution B5 'Definition of a Planet in the Solar System' (2006, iau.org); corroborated by Encyclopaedia Britannica's entry on 'planet'
    #8638International Astronomical Union (iau.org), Resolution B5 (2006); corroborated by Encyclopaedia Britannica
    135 more
    #12078Wikipedia, IAU definition of planet (citing IAU 2006 Resolution B5/B6): the eight planets are Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune
    #7518IAU Resolution B5, IAU General Assembly, Prague, 24 August 2006 (iau.org); Encyclopaedia Britannica, "planet"
    #5958IAU (International Astronomical Union), Resolution B5 "Definition of a Planet in the Solar System" (2006); confirmed by NASA Solar System Exploration (solarsystem.nasa.gov) which states there are eight planets under this definition.
    #12948IAU Resolution B5 (2006) via iau.org, corroborated by Encyclopaedia Britannica's "planet" article — both state the Solar System has eight planets under the 2006 IAU definition.
    #1538International Astronomical Union (IAU) Resolution B5/B6, 2006, 'Definition of a Planet in the Solar System', reaffirmed on the IAU's official website (iau.org); consistent with NASA Solar System Exploration ('Our Solar System', solarsystem.nasa.gov) and Encyclopaedia Britannica ('planet' / 'Solar System' entries), all of which list 8 planets (Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune) since Pluto was reclassified as a dwarf planet under the 2006 definition.
    #11998International Astronomical Union, Resolution B5 (2006); corroborated by Encyclopaedia Britannica
    #14778NASA Solar System Exploration (solarsystem.nasa.gov) and the International Astronomical Union (IAU) Resolution B5, 'Definition of a Planet in the Solar System' (adopted 24 August 2006, IAU XXVI General Assembly, Prague), both state that under the 2006 definition there are 8 planets: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune. Pluto was reclassified as a dwarf planet.
    #18608NASA Solar System Exploration (solarsystem.nasa.gov/planets) and IAU Resolution B5 (2006), which define a planet as a body orbiting the Sun that is round due to hydrostatic equilibrium and has cleared its orbital neighborhood, yielding eight planets: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune.
    #6068International Astronomical Union, Resolution B6 'Definition of a Planet in the Solar System' (2006, iau.org), corroborated by Encyclopaedia Britannica's 'planet' article
    #5408International Astronomical Union (IAU), Resolution B5 (2006) and IAU FAQ on the definition of a planet: under the 2006 definition, a planet must (a) orbit the Sun, (b) be in hydrostatic equilibrium (nearly round shape), and (c) have cleared its orbital neighborhood. This reclassified Pluto as a 'dwarf planet', leaving eight planets: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune.
    #3418Encyclopaedia Britannica, "IAU 2006 General Assembly: Result of the IAU Resolution votes" / Britannica article on the definition of planet, confirming the 2006 IAU General Assembly definition yields eight planets in the Solar System, with Pluto reclassified as a dwarf planet.
    #14998IAU (iau.org) Resolution B5 (2006) 'Definition of a Planet in the Solar System'; corroborated by Encyclopaedia Britannica, 'planet'.
    #14648International Astronomical Union, Resolution B5 'Definition of a Planet in the Solar System' (2006), iau.org; corroborated by Encyclopaedia Britannica's entry on 'planet'.
    #6848International Astronomical Union (IAU), Resolution B5 'Definition of a Planet in the Solar System', adopted 24 August 2006 at the IAU General Assembly (iau.org), which establishes 8 planets (Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune) and reclassifies Pluto as a 'dwarf planet'; corroborated by Encyclopaedia Britannica's entry on the 2006 IAU planet definition.
    #7088NASA Solar System Exploration (solarsystem.nasa.gov/planets) and Encyclopaedia Britannica, 'planet' / IAU 2006 definition entry
    #13148IAU Resolution B5 (2006), 'Definition of a Planet in the Solar System' (iau.org); corroborated by Encyclopaedia Britannica's 'planet' entry.
    #298IAU Resolution B5 (2006); Encyclopaedia Britannica, 'planet'
    #7068NASA Solar System Exploration (solarsystem.nasa.gov, 'Our Solar System' overview) and Encyclopaedia Britannica ('planet' and 'International Astronomical Union' articles), both stating that the IAU's 2006 Resolution B5 defines a planet and recognizes eight planets in the Solar System: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune (Pluto was reclassified as a dwarf planet).
    #68IAU Resolution B5 (2006), 'Definition of a Planet in the Solar System' (iau.org); corroborated by Encyclopaedia Britannica, 'planet' article
    #15408International Astronomical Union, Resolution B5 (2006); corroborated by NASA Solar System Exploration and Encyclopaedia Britannica
    #6718International Astronomical Union Resolution B5 (2006); NASA Solar System Exploration
    #2948NASA Solar System Exploration (science.nasa.gov/solar-system/planets) and Encyclopaedia Britannica ('Planet' article), both stating that under the IAU's 2006 resolution the Solar System has eight officially recognized planets: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune. Pluto was reclassified as a dwarf planet by the same 2006 IAU resolution.
    #15058International Astronomical Union, IAU Resolution B5 "Definition of a Planet in the Solar System" (24 August 2006), www.iau.org
    #14718International Astronomical Union, Resolution B5 'Definition of a Planet in the Solar System' (24 August 2006, iau.org); corroborated by Encyclopaedia Britannica, 'planet' article.
    #8008International Astronomical Union (IAU), Resolution B5, 2006 General Assembly (iau.org)
    #8668International Astronomical Union, Resolution B5 "Definition of a Planet in the Solar System" (IAU 2006 General Assembly, iau.org); corroborated by Encyclopaedia Britannica, "planet"
    #7298IAU Resolution B5/B6 (2006), iau.org; Encyclopaedia Britannica, 'planet'
    #19648International Astronomical Union, Resolution B5 'Definition of a Planet in the Solar System' (2006), as summarized on the IAU's official website (iau.org) and Encyclopaedia Britannica's article 'planet' / 'Pluto'
    #9128NASA Solar System Exploration (solarsystem.nasa.gov), citing IAU Resolution B5 (2006)
    #12718IAU 2006 Resolution B5/B6 as summarized on Wikipedia 'IAU definition of planet' (eight planets: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune)
    #18798Encyclopaedia Britannica, 'planet' (britannica.com), corroborated by the International Astronomical Union's 2006 General Assembly Resolution B5 'Definition of a Planet in the Solar System', which formally establishes eight planets and reclassifies Pluto as a dwarf planet.
    #11338Encyclopaedia Britannica ("planet" / "dwarf planet" articles) and the International Astronomical Union's 2006 General Assembly Resolution B5, which defines a "planet" and states that under this definition the Solar System has eight planets, with Pluto reclassified as a dwarf planet
    #4298IAU Resolution B5 (2006); Encyclopaedia Britannica, 'planet'
    #18718International Astronomical Union, Resolution B5 "Definition of a Planet in the Solar System" (2006), as summarized by the IAU (iau.org) and Encyclopaedia Britannica's article "planet": under the 2006 IAU definition there are eight planets in the Solar System (Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune), with Pluto reclassified as a dwarf planet.
    #8238International Astronomical Union (IAU), Resolution B5 'Definition of a Planet in the Solar System', adopted 24 August 2006, and the IAU's public FAQ on the planet definition, both stating the Solar System has eight planets under the 2006 definition.
    #15548IAU (International Astronomical Union) Resolution B5, 'Definition of a Planet in the Solar System', adopted at the IAU General Assembly, Prague, 24 August 2006
    #618Encyclopaedia Britannica (britannica.com), entries on "planet" and the IAU's 2006 planet definition, confirming eight IAU-recognized planets (Mercury through Neptune) after Pluto's 2006 reclassification as a dwarf planet.
    #1928Wikipedia, IAU definition of planet (IAU 2006 Resolution B5: eight planets, Mercury to Neptune); consistent with IAU.org and Britannica
    #4938International Astronomical Union, Resolution B5 (2006), "Definition of a Planet in the Solar System"; corroborated by Encyclopaedia Britannica, "planet" / "solar system" articles.
    #9018International Astronomical Union, Resolution B5 (2006), and NASA Solar System Exploration overview
    #7358Encyclopaedia Britannica
    #3518International Astronomical Union, Resolution B5 (2006), "Definition of a Planet in the Solar System"; corroborated by Encyclopaedia Britannica's article on the IAU's 2006 planet definition.
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