Today's Mars photo is of Olympus Mons, the tallest known mountain and volcano in the solar system. At an estimated height of anywhere between 21-29 km, Olympus Mons is about three times as tall as Mount Everest. The whole mountain covers an area that is approximately the size of Arizona.
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| Olympus Mons photo originally taken by Viking 1 on June 22 1978 |
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