Galileos measure Einsteinian time dilation. (Credit: ESA-P. Carril/Wikimedia Commons/G. Porter)
PARIS (ESA PR) — Europe’s Galileo satellite navigation system – already serving users globally – has now provided a historic service to the physics community worldwide, enabling the most accurate measurement ever made of how shifts in gravity alter the passing of time, a key element of Einstein’s Theory of General Relativity.