This image covers the northern edge of the solar system's largest volcano, Olympus Mons. The margin of Olympus Mons is defined by a massive cliff several miles tall. At this location, it is nearly 23,000 feet tall. The cliff exposes the guts of the volcano, revealing interbedded hard and soft layers. The hard layers are lava and the soft layers may be dust (from large dust storms) or volcanic ash.