Photon collision at a time interface (IMAGE) Advanced Science Research Center, GC/CUNY Caption Schematic drawing of a photon collision at a time interface. Credit Anna Umana, Advanced Science Research Center at the CUNY Graduate Center Usage Restrictions All rights reserved. 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.