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813 furlongs is about six times as as Olympus Mons.
In other words, it's 6.1 times the of Olympus Mons, and the of Olympus Mons is 0.16 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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