引力波
拉广义相对论里，引力波是时空个涟漪。当投掷石头到池塘里时，会拉池塘表面产生涟漪，从石头入水个位置向外传播。当带质量物体呈加速度运动时，会拉时空产生涟漪，从带质量物体位置向外传播，箇时空个涟漪就是引力波。
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