A Nuclear Breakthrough Could Help Us Make The Most Accurate Clock in Existence – ScienceAlert

The most accurate clocks in existence aren’t based on a quartz movement or a balance wheel, but the ticking of electrons in an atomic shell. The best of these atomic clocks are accurate to one part in 1018 – so precise, they would not have yet lost a single second in all the billions of years since the Universe began.
There’s a potential new kind of clock that could improve this precision by an order of magnitude, to one part in 1019. It’s based on the ticking of nuclei of a thorium isotope, bu…

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