The magnetic field of Neptune. (IMAGE) GFZ Helmholtz-Zentrum für Geoforschung Caption The magnetic field of Neptune, like that of the Earth, is not static but varies over time. Pictured is a snapshot from August 2004. Credit NASA's Scientific Visualization Studio 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.