Olympus Mons is the largest volcano in the solar system. It stands 26 kilometers (15.5 miles) above the surrounding plains, and is 500 kilometers (300 miles) wide at its base.
Olympus Mons is the largest volcano in the solar system. It stands 26 kilometers (15.5 miles) above the surrounding plains, and is 500 kilometers (300 miles) wide at its base.