Quasar (IMAGE) University of Colorado at Boulder Caption A new CU-Boulder study shows that distant quasars teamed up to stifle the formation of small galaxies billions of years ago. Credit NASA 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.