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惑星(Hi̍k-tshenn;英文:planet)是佇軌道咧踅的星體,毋過依本身毋是,嘛毋是長尾星,惑星嘛有咱講做行星

希臘語共惑星號做πλανήτης, planētēs,意思是天頂拋拋走的羅漢跤仔。

惑星的定義在來攏有爭議,有的天文學家建議冥王星莫算做太陽系的惑星,有的講愛閣增加到15、20甚至閣較濟,國際天文組合 (International Astronomical Union)佇2006年決議共冥王星掠做矮惑星,徛講咱徛的太陽系 (solar system)有8粒惑星。

太陽系以外有星系 (star system)有極短周期惑星。


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