how tall in feet is mars'  olympus mons
A-olympus mons a 69000-foot-tall mountain on mars is the. A-Olympus Mons, a 69,000-foot-tall mountain on Mars, is the largest volcano in the solar system. Its circumference at the base is large enough to cover almost the entire state of Colorado. A space probe could safely land at almost any point on the volcano without fear of it toppling over due to a landing on a steep slope.