Diagram of Sun Layers (image) NASA/Goddard Space Flight Center Share Print E-Mail Caption Scientists have used data from ESA and NASA's Solar and Heliospheric Observatory, or SOHO, to detect a type of wave called g-modes on the Sun. These g-modes reveal that the solar core is rotating about four times faster than the surface. Credit ESA Usage Restrictions None Share Print E-Mail 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.