The planet with the largest volcano in the solar system is Mars. Known as Olympus Mons, this colossal shield volcano stands approximately 13.6 miles (22 kilometers) high, making it nearly three times the height of Mount Everest. Olympus Mons features a diameter of about 370 miles (600 kilometers) and is surrounded by a steep cliff that rises several miles high. The volcano’s size is attributed to Mars' lack of tectonic plate movement, which allows magma to accumulate over time without being disrupted. Olympus Mons is a fascinating subject for researchers studying volcanic activity, planetary geology, and the history of Mars, hinting at its geological past.