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See also: Asteroid

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EnglishEdit

PronunciationEdit

Etymology 1Edit

Borrowed from Ancient Greek ἀστεροειδής (asteroeidḗs), from ἀστήρ (astḗr, star) + εἶδος (eîdos, form).

NounEdit

asteroid (plural asteroids)

  1. (zoology) Any member of the taxonomic class Asteroidea; a starfish

Related termsEdit

Etymology 2Edit

 
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An asteroid.

aster +‎ -oid Coined by William Herschel, terming these objects "star-like"

NounEdit

asteroid (plural asteroids)

  1. (astronomy) A naturally occurring solid object, which is smaller than a planet and is not a comet, that orbits a star
  2. (astronomy) In the Solar system, such a body that orbits within the orbit of Jupiter
    • 2007, Hannu Karttunen et al., editor, Fundamental Astronomy, 5 edition, page 131:
      The orbital planes of asteroids, minor bodies that circle the Sun mainly between the orbits of Mars and Jupiter, are often more tilted ...
Usage notesEdit

The term "asteroid" has never been precisely defined. It was coined for objects which looked like stars in a telescope but moved like planets. These were known from the asteroid belt between Mars and Jupiter, and were later found co-orbiting with Jupiter (Trojan asteroids) and within the orbit of Mars. They were naturally distinguished from comets, which did not look at all starlike. Starting in the 1970s, small non-cometary bodies were found outside the orbit of Jupiter, and usage became divided as to whether to call these "asteroids" as well. Some astronomers restrict the term "asteroid" to rocky or rocky-icy bodies with orbits up to Jupiter. They may retain the term planetoid for all small bodies, and thus tend to use it for icy or rocky-icy bodies beyond Jupiter, or may use dedicated words such as centaurs, Kuiper belt objects, transneptunian objects, etc. for the latter. Other astronomers use "asteroid" for all non-cometary bodies smaller than a planet, even large ones such as Sedna and (occasionally) Pluto. However, the distinction between asteroid and comet is an artificial one; many outer "asteroids" would become comets if they ventured nearer the Sun. The IAU terminology since 2006 has been small Solar System body for any body that orbits the Sun directly and whose shape is not dominated by gravity.

Derived termsEdit
Related termsEdit
TranslationsEdit

See alsoEdit

Further readingEdit

AnagramsEdit


CzechEdit

NounEdit

asteroid m

  1. asteroid

DeclensionEdit

See alsoEdit


EstonianEdit

EtymologyEdit

  This entry lacks etymological information. If you are familiar with the origin of this term, please add it to the page per etymology instructions. You can also discuss it at the Etymology scriptorium.

NounEdit

asteroid (genitive [please provide], partitive [please provide])

  1. asteroid

InflectionEdit

This noun needs an inflection-table template.


IndonesianEdit

NounEdit

asteroid

  1. asteroid

RomanianEdit

EtymologyEdit

Borrowed from French astéroïde.

NounEdit

asteroid m (plural asteroizi)

  1. asteroid

DeclensionEdit


Serbo-CroatianEdit

NounEdit

asteròīd m (Cyrillic spelling астеро̀ӣд)

  1. asteroid

DeclensionEdit


SloveneEdit

PronunciationEdit

NounEdit

asteroíd m inan (genitive asteroída, nominative plural asteroídi)

  1. asteroid

DeclensionEdit


SwedishEdit

PronunciationEdit

NounEdit

asteroid c

  1. asteroid

DeclensionEdit

Declension of asteroid 
Singular Plural
Indefinite Definite Indefinite Definite
Nominative asteroid asteroiden asteroider asteroiderna
Genitive asteroids asteroidens asteroiders asteroidernas