The highest mountain discovered is the Olympus Mons, which is located on Mars.

The highest mountain discovered is the Olympus Mons, which is located on Mars.

Olympus Mons rises three times higher than Earth's highest mountain, Mount Everest, whose peak is 5.5 miles above sea level. Olympus Mons is a shield volcano. Rather than violently spewing molten material, shield volcanoes are created by lava slowly flowing down their sides.

Olympus Mons, volcano on the planet Mars, the highest point on the planet and the largest known volcano in the solar system. Centred at 19° N, 133° W, Olympus Mons consists of a central edifice 22 km (14 miles) high and 700 km (435 miles) across.

Olympus Mons is a shield volcano 624 km (374 mi) in diameter (approximately the same size as the state of Arizona), 25 km (16 mi) high, and is rimmed by a 6 km (4 mi) high scarp. A caldera 80 km (50 mi) wide is located at the summit of Olympus Mons.