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李宏

行星与恒星(宇宙瞭望书坊)

恒星是指能自己能进行核聚变,且发光发热的星体,行星,彗星等都是围着恒星转。行星具有一定质量并且近似圆球形,本身不发光,围绕着恒星转的天体。
53 printed pages
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