Muon shower (IMAGE) University of Tokyo Caption A bonus of this approach to synchronizing time is that if it is further developed into a spatial positioning system, it avoids a potential security issue that GPS cannot. GPS signals are artificial and can be hacked, but cosmic rays cannot be created artificially so cannot be faked. Credit ©2022 Hiroyuki K. M. Tanaka Usage Restrictions credit ©2022 Hiroyuki K. M. Tanaka License Original 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.