Photon Ring Infographic (IMAGE) Institute for Advanced Study Caption Reference: Universal Interferometric Signatures of a a Black Hole's Photon Ring Credit Credit: Michael D. Johnson (CfA), Simulation: George Wong (UIUC) 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.