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Planetoid Meaning: Definition, Examples, and Translations

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planetoid

[ˈplænɪtɔɪd ]

Definition

Context #1 | Noun

astronomy

A planetoid is a small celestial body that orbits the sun, similar to a planet but significantly smaller than a major planet. Planetoids are often called asteroids and can be found primarily in the asteroid belt between Mars and Jupiter. They can vary in size, shape, and composition, with some being rocky and others icy.

Synonyms

asteroid, minor planet, small celestial body.

Examples of usage

  • The planetoid Ceres is located in the asteroid belt.
  • Astronomers discovered a new planetoid in the Kuiper Belt.
  • Many planetoids have irregular shapes and sizes.

Translations

To see the translation, please select a language from the options available.

Interesting Facts

Astronomy

  • Planetoids are often found in the asteroid belt between Mars and Jupiter, where they are remnants from the formation of the solar system.
  • Dwarf planets, like Pluto and Ceres, are considered planetoids as they are too small to be full-fledged planets.

Space Exploration

  • Many planetoids have been visited by spacecraft, which provide valuable information about the early solar system.
  • The New Horizons mission flew by Pluto, revealing it as a planetoid with complex geology and a thin atmosphere.

Cultural References

  • Science fiction often features planetoids as settings for stories, depicting them as unique worlds with various life forms.
  • In some games, players can explore planetoids, highlighting the imaginative possibilities surrounding these small celestial bodies.

Physics

  • Planetoids can have varying shapes and compositions, leading to discussions among scientists about their formation and evolution.
  • The gravitational influence of a planetoid can affect nearby bodies, showcasing their role in the dynamics of the solar system.

Origin of 'planetoid'

Main points about word origin

  • The term 'planetoid' comes from the Greek word 'planetes' meaning 'wanderer', which was used for planets.
  • It was first used in the late 19th century, reflecting the discovery of small celestial bodies similar to planets.

The term 'planetoid' originates from the Greek words 'planetes,' meaning 'wanderer' (referring to the planets), and the suffix '-oid,' which denotes resemblance or likeness. The word began to be used in the early 19th century as astronomers started to discover smaller bodies in the solar system that resembled planets but were far less massive. The study of these celestial objects gained momentum with advancements in telescopes and space exploration technology, leading to a better understanding of the composition and dynamics of planetoids. The classification of planetoids also reflects the broader category of small solar system bodies, which includes comets and meteoroids.

Word Frequency Rank

At position #40,024, this word is among the less frequently used terms in English. While interesting to know, it's not crucial for most English learners unless needed for specific purposes.