Gravitational Interaction (IMAGE) University of Chicago Caption In this image from a supercomputer simulation, gravitational interaction between colliding galaxies generates spectacular tidal tails, plumes and prominent bridges of material connecting the two galaxies. Credit Image courtesy of Stelios Kazantzidis 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.