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403 leas is about one-and-one-tenth times as tall as Olympus Mons.
In other words, the height of Olympus Mons is 0.910 times that amount.
(a.k.a. Mount Olympus) (Mars)
The tallest mountain in the solar system, Olympus Mons rises to approximately 370 leas. 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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