what is the largest volcanic mountain/storm in the solar system
by Jerry Coffey on July 16, 2008. The largest volcano in the Solar System and the largest mountain in the Solar System are one in the same: Olympus Mons on Mars. Olympus Mons is a shield volcano that towers to an amazing 26 km.That makes it 3 times the height of Mt. Everest. Unlike Everest, Olympus Mons has a very gentle slope.he largest volcano in the Solar System and the largest mountain in the Solar System are one in the same: Olympus Mons on Mars.