The tallest volcano in the solar system is Olympus Mons, located on Mars. This enormous shield volcano stands approximately 13.6 miles (22 kilometers) high, making it nearly three times the height of Mount Everest, Earth's tallest peak. Olympus Mons is characterized by its wide base and gentle slopes, typical of shield volcanoes formed by the eruption of low-viscosity lava. Its size and features make it a fascinating subject for planetary scientists, providing insights into volcanic activity and geological processes on Mars and throughout the solar system.