Great Mountains of the Solar System
Olympus Mons
Olympus Mons is the undisputed king of the volcanoes in the solar system. Its slopes rise 15 miles (24 kilometers) above the plane, and it is 342 miles (550 kilometers) across at its base. (Click to enlarge this image.)
Mars Global Surveyor Project, MSSS, JPL, NASA
   
 
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