Model of a gravastar (IMAGE) Goethe University Frankfurt Caption According to findings by physicists at Goethe University Frankfurt, a gravastar could look like a matryoshka doll. Credit Daniel Jampolski and Luciano Rezzolla, Goethe University Frankfurt Usage Restrictions To be used only when mentioning copyright as: Daniel Jampolski and Luciano Rezzolla, Goethe University Frankfurt 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.