Earth in Space-Time (IMAGE) American Physical Society Caption Representative illustration of the Earth embedded in space-time (which is deformed by the background gravitational waves) and its effects on radio signals coming from observed pulsars. Credit Tonia Klein / NANOGrav Usage Restrictions Credit as noted. 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.