In Vienna and Beijing, the first (thorium) nuclear clocks begin to tick

Researchers in Vienna and Beijing have successfully demonstrated the first operational nuclear clocks based on thorium-229. Unlike traditional atomic clocks that rely on electron transitions in atoms like cesium or strontium, these new devices utilize the energy transitions of an atomic nucleus. Because nuclear transitions are significantly less sensitive to external environmental interference, such as electromagnetic fields, these clocks promise unprecedented levels of precision. This breakthrough represents a major milestone in metrology, potentially enabling more accurate GPS navigation, deeper insights into fundamental physics, and the detection of dark matter. The development marks the transition of nuclear clock technology from theoretical physics into practical, experimental reality, paving the way for a new generation of timekeeping devices that could redefine our measurement of time and physical constants.