精度可达每3000亿年误差一秒,但核心材料全球仅40克改写时间定义,核钟制造有多难自1967年以来,“秒”的定义一直用的是铯原子内部的电子振荡频率。随着核钟的诞生,时间定义或将被改写。从更精准的卫星导 ……
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