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Planeta

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La planeta Tèrra
La planeta Saturne

Una (o un) planeta (del grèc ancian ἀστήρ πλανήτης, astēr planētēs)[1] es un còs celèstial que descriu una orbita elliptica a l'entorn d'una estela.

Segon la definicion de l’Union Astronomica Internacionala, i a uèch planetas dins lo Sistèma Solar : Mercuri, Vènus, la Tèrra, Mart, Jupitèr, Saturne, Uranus e Neptun.

Referéncias[modificar | modificar la font]

  1. 'Planet Etymology
  2. This definition is drawn from two separate IAU declarations; a formal definition agreed by the IAU in 2006, and an informal working definition established by the IAU in 2001/2003 for objects outside of the Solar System. The official 2006 definition applies only to the Solar System, whereas the 2003 definition applies to planets around other stars. The extrasolar planet issue was deemed too complex to resolve at the 2006 IAU conference.
  3. IAU 2006 General Assembly: Result of the IAU Resolution votes
  4. Working Group on Extrasolar Planets (WGESP) of the International Astronomical Union