En Planed iss en Himmelskerber, dem sai Mass groß genuch iss, um dorsch die Gravidadsion e ainischermaße rundi Form zu hawwe.
Er hot ä aischene Umlaufbohn um e Sunn unn isses dominierende Objekt uff derre Umlaufbohn. Des Sunnesyschdem hot achd Planede, uffgezählt vun inne nach auße: Merkur, Venus, Erd, Mars, Jupiter, Saturn, Uranus un Neptun. De Pluto hot mer frieher aa zu de Planede gezähld, der kehrd awwer inzwische zu de Zwerchplanede. Viele Planede henn aischene Trabande, sogenannde Monde, die wo se umkraise duun. Baischbiel dodefier sinn de Erdmond, de Titan vum Saturn unn de Ganymed vum Jupiter.
De easch Planed, wuma drausse ausm Sunnesischdem gfunne kabd hod graisd umde Pulsar PSR B1257+12. Do hods drai Blonede mid 4,3, 3,9 un 0,02 Erdmasse.
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