A heavenly body kept in orbit around a planet by gravitational force.
一种因引力而沿轨道绕行星旋转的天体。
Solar system is by receives the system which the gravitational pull restraint the heavenly body is composed, its most wide range approximately may extend to 1 light year outside.
太阳系是由受太阳引力约束的天体组成的系统，它的最大范围约可延伸到1光年以外。
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