largest mountain in the solar system
Its outer edge is defined by an escarpment up to 6 km tall; unique among the shield volcanoes of the Red Planet. It is also the highest mountain in the solar system and the solar system's largest volcano. In this NASA image above, Olympus Mons is the largest volcano. Lava flows from Olympus Mons and its neighboring volcanoes have resurfaced the planet in this area.