目前世界最精确原子钟的误差约为数亿年1秒,如英国国家物理实验室的NPL-CsF2铯原子钟,其1.38亿年的误差为正负1秒。但原子钟与研究人员正在研发的原子核钟的精确度相比,不过是小巫见大巫。美国和澳大利亚科学家表示,在他们制定的蓝图中,原子核时钟的精确度确定为140亿年(宇宙寿命) At present, the error of the most accurate atomic clock in the world is about hundreds of millions of years and 1 second. For example, the NPL-CsF2 cesium atomic clock of the British National Physical Laboratory has a positive and negative error of 138 million years. But atomic clocks are nothing compared to the accuracy of atomic clocks that researchers are developing. U.S. and Australian scientists said that in their blueprint, the accuracy of the nuclear clock was set at 14 billion years (cosmic life)