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813 furlongs is about six times as tall as Olympus Mons.
In other words, it's 6.10 times the height of Olympus Mons, and the height of Olympus Mons is 0.160 times that amount.
(a.k.a. Mount Olympus) (Mars)
The tallest mountain in the solar system, Olympus Mons rises to approximately 130 furlongs. The mountain has been known to astronomers since the nineteenth century because it is tall enough to rise above Mars' frequent dust storms.
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