Glossary term: 系外行星
Description: 系外行星，或太阳系外行星，是指位于太阳系之外的行星。关于系外行星存在的理论源于16世纪，就有了，而旨在寻找系外行星的观测研究开始于19世纪。第一批被证实存在的系外行星是在20世纪90年代发现的。其中，Dimidium是第一颗被证实围绕主序星运行的系外行星，它由法国东南部的上普罗旺斯天文台间接发现。这颗系外行星环绕着1995年被发现的黄色亚巨星飞马座51运行。在那之后，人们又发现了数千颗系外行星。
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Term and definition status: The original definition of this term in English have been approved by a research astronomer and a teacher The translation of this term and its definition is still awaiting approval
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