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唯一的原因是引力的强度與距離的關係 引力强度與距離的平方成反比.環繞軌道半徑就是這個距離,它越大,引力所提供的向心力越小,向心加速度、線速度、角速度自然都减小. 線速度减小,用變慢的速度跑更大的圈子,週期自然增大.另外,角速度本身就是週期的倒數.
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