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Viking 1 close-up image of Olympus Mons, a giant volcano on Mars
NASA / JPL Image
 

Image 1-8
Olympus Mons
This image of Olympus Mons on Mars was taken by the Viking 1 Orbiter. It is an extinct volcano over 16 miles high. This makes it the largest known volcano in the solar system, three times higher than Mt. Everest on Earth.

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