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Which volcano is the tallest on Mars and in the solar system?
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Mars
An especially serene view of Mars (Tharsis side), a composite of images taken by the Mars Global Surveyor spacecraft in April 1999. The northern polar cap and encircling dark dune field of Vastitas Borealis are visible at the top of the globe. White water-ice clouds surround the most prominent volcanic peaks, including Olympus Mons near the western limb, Alba Patera to its northeast, and the line of Tharsis volcanoes to the southeast. East of the Tharsis rise can be seen the enormous near-equatorial gash that marks the canyon system Valles Marineris.
The tallest volcano on Mars and in the entire solar system is Olympus Mons.
This massive shield volcano stands approximately 22 km (14 miles) high and spans 700 km (435 miles) across. Its immense size is attributed to the stability of the Martian crust and a long period of volcanic activity, potentially spanning over a billion years.1