Ancient Stars (1 of 2) (IMAGE) Durham University Caption This simulation shows a Milky Way-like galaxy around five billion years ago when most satellite galaxy collisions were happening. Credit Andrew Cooper/John Helly, Durham University 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.