Space-time Crystal (IMAGE) DOE/Lawrence Berkeley National Laboratory Caption This proposed space-time crystal shows (a) periodic structures in both space and time with (b) ultracold ions rotating in one direction even at the lowest energy state. Credit Courtesy of Xiang Zhang group, Berkeley Lab-UC Berkeley Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.