Sun and Mercury (IMAGE) Vienna University of Technology Caption Particles from the sun are constantly hitting the surface of mercury. Credit pictures: NASA, montage: TU Wien Usage Restrictions NASA Media Usage Guidelines: https://www.nasa.gov/multimedia/guidelines/index.html 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.