Tharsis Volcano (IMAGE) Brown University Caption This simulated perspective oblique view shows Olympus Mons, the tallest volcano not only on Mars but in the entire solar system. The volcano measures some 600 km across. Credit Credit: ESA/DLR/FU Berlin (A. Valantinas) Usage Restrictions Credit must be given to the creator. License CC BY 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.