Olympus Mons is a very large shield volcano on the planet Mars. The volcano has a height of nearly 22 km as measured by the Mars Orbiter Laser Altimeter. Olympus Mons is about two and a half times Mount Everest's height above sea level. Olympus Mons is the largest volcano in the solar system. The massive Martian mountain towers high above the surrounding plains of the red planet, and may be biding its time until the next eruption.
Discovered by NASA 's Mariner 9
Credit: NASA
It is the tallest planetary mountain in the solar system.
