Glossary term: 行星系统
Description: 行星系统是指一颗或多颗行星围绕一颗或多颗恒星、褐矮星和/或恒星遗迹运行的系统。我们的太阳系就是一个以太阳为中心的行星系统·。在过去的几十年里，已经发现了数以千计的围绕着太阳以外的恒星绕转的行星系。目前已知的少数情况是，行星系的中心天体是一颗褐矮星或恒星遗迹，如中子星或白矮星。
行星系统也可以是绕多个恒星运行的系统，例如围绕比邻星运行的行星，比邻星是距离太阳最近的恒星，也是一个三星系统的成员。还有一些围绕双星系统中两颗恒星运行的行星。
行星系统的规模差别很大，有些行星的轨道距离其主恒星只有几个恒星半径，而有些行星的轨道则有数千个天文单位（一个天文单位相当于地球-太阳的平均距离）。
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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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