dwarf planet


Definition of dwarf planet 

: a celestial body that orbits the sun and has a spherical shape but is not large enough to disturb other objects from its orbit

Examples of dwarf planet in a Sentence

Recent Examples on the Web

That set the expectations for the dwarf planets, which were thought to be cold and dead. John Timmer, Ars Technica, "Ice volcanoes have likely been erupting for billions of years on Ceres," 18 Sep. 2018 Perhaps the most notable discovery Dawn ever made was discovering organic molecules on Ceres, meaning that the dwarf planet has at least some of the building blocks for life. Avery Thompson, Popular Mechanics, "NASA's Asteroid Belt Spacecraft Dawn Is About To Run Out of Fuel," 11 Sep. 2018 As The New York Times reported, Pluto was downgraded in 2006 from planet to dwarf planet. Janay Moore, Teen Vogue, "Pluto Should Be a Planet Again According to These Scientists," 11 Sep. 2018 The dwarf planet also shares its orbit with frozen gases and objects in the Kuiper belt, researchers note. James Rogers, Fox News, "Pluto should be a planet again, researchers argue," 10 Sep. 2018 Previously, scientists thought protoplanets did not get much larger than dwarf planet Ceres, or about a sixth the diameter of Mercury. John Wenz, Popular Mechanics, "Diamond-Encrusted Meteorite Could Be From a Lost Planet," 17 Apr. 2018 Still, finding dunes on Pluto was unexpected, given the dwarf planet’s very thin air, experts said. Mike Wall, Scientific American, "Pluto Has Dunes, But They’re Not Made of Sand," 1 June 2018 Charon, meanwhile, shows some signs of water ices, which confirms some suspicions long held about what is either a moon or a binary dwarf planet. John Wenz, Popular Mechanics, "What New Horizons Has Already Told Us About Pluto," 13 July 2015 But with the realization that Pluto was a Kuiper belt dwarf planet, researchers began speculating about the origins of the icy world. Julissa Treviño, Smithsonian, "Is Pluto Actually a Mash-up of a Billion Comets?," 30 May 2018

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'dwarf planet.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of dwarf planet

1993, in the meaning defined above

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Last Updated

1 Dec 2018

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The first known use of dwarf planet was in 1993

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dwarf planet


Kids Definition of dwarf planet

: a heavenly body similar to a planet but too small to clear other objects from its orbit

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