Layers inside a massive neutron star 1 (IMAGE) University of Helsinki Caption Artist’s impression of the different layers inside a massive neutron star, with the red circle representing a sizable quark-matter core. Credit Jyrki Hokkanen, CSC Usage Restrictions Credit must be given to the creator. License CC BY 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.