Pulsars in a Sea of Gravitational Waves (IMAGE) California Institute of Technology Caption Artist's concept of a collection of pulsars that detect gravitational waves from pairs of orbiting supermassive black holes. Credit Aurore Simonnet for the NANOGrav Collaboration Usage Restrictions No restrictions. License CC0 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.