Red ultradiffuse galaxy (VIDEO) University of California - Riverside This video is under embargo. Please login to access this video. Caption Animation shows a rotation around one of the simulated ultradiffuse galaxies in TNG50. Red indicates stars, and the blue/white colors show the gas content. Credit Jose Benavides. Usage Restrictions None. License Original 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.