Robert C. Byrd Green Bank Telescope (IMAGE) National Radio Astronomy Observatory Caption The Robert C. Byrd Green Bank Telescope in West Virginia, the world's largest fully steerable radio telescope antenna. Its great sensitivity made possible the magnetic-field measurement in the distant protogalaxy. Credit NRAO/AUI/NSF 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.