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祐生国际科普行星 行星,通常指自身不发光,环绕着恒星的天体。其公转方向常与所绕恒星的自转方向相同。(祐生国际)一般来说行星需具有一定质量,行星的质量要足够的大且近似于圆球状,自身不能像恒星那样发生核聚变反应。(祐生国际) 祐生国际科普行星

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