Hubble Space Telescope image of Arp 220 (IMAGE) University of Oklahoma Caption Griffin and Dai developed the data collection methodology used to detect the gamma-ray emission from Arp 220 Credit University of Oklahoma and NASA 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.