Merger of Two Galaxies (IMAGE) University of Zurich Caption This simulation shows how two galaxies merge over a period of 15 million years. The red and the blue dots illustrate the two black holes. Credit (Image: Astrophysical Journal) 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.