Heliosphere and Magnetic Field Lines (IMAGE) University of Maryland Caption The yellow shape in this figure is the heliopause, the boundary between the heliosphere and the local interstellar medium. The sun sits at the center of this large bubble, but is too small to be seen in this image. The gray lines are the solar magnetic field lines and the red lines are the interstellar magnetic field. Credit Merav Opher 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.