Gravity slows time: a clock on the second floor runs fast compared to one in the basement. The new method catches this effect in atomic nuclei using synchrotron light. A tiny frequency shift builds up like a phase slip — and after a few hours at a height of three meters, it becomes noticeable. In this way, nuclei will help test Einstein's theory with record precision.
🎯 Iron-57 nuclei work at ordinary temperatures, needing no bulky cryostats — it's the only isotope that enables such ultra-precise measurements on a tabletop.
🎬 In 'Interstellar', the characters face a monstrous time differential near a black hole; the new method catches the same effect, only billions of times weaker, on a lab bench.