black-hole-simulation-NASA (IMAGE) University of California - Santa Barbara Caption When two black holes merge, they release gravitational waves, that when lensed by massive objects as they travel to Earth, could be used to calculate the rate of cosmic expansion. Credit NASA's Goddard Space Flight Center/Scott Noble; simulation data, d'Ascoli et al. 2018 Usage Restrictions For Use with Credit. 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.