Simulation of Red Giant Star Traveling Through a Fragmenting Accretion Disk (video) Georgia Institute of Technology Share Print E-Mail Loading video... Caption Simulation of a red giant undergoing multiple collisions with clumps in a fragmenting accretion disk. As the star pummels the disk, it develops a bow shock ahead of the star and a cometary tail behind it. The tail is essentially the gas that is stripped from the star as it passes through and loses a portion of its overall mass. Credit Georgia Tech Usage Restrictions None Share Print E-Mail 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.