Planet Formation around Stars (IMAGE) University of Copenhagen Caption New research shows that planets up to four times the size of the Earth can form around very different stars -- including stars that are poorer in heavy elements. Credit MediaFarm / Niels Bohr Institute Usage Restrictions Credit: MediaFarm / Niels Bohr Institute 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.