Pulsar Orbiting a Black Hole (IMAGE) Spanish Foundation for Science and Technology Caption Discovering a pulsar orbiting a black hole could be the 'holy grail' for testing gravity. Credit SKA Organisation/Swinburne Astronomy Productions Usage Restrictions None 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.