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Mars has the tallest known mountain in the solar system, Olympus Mons, which is nearly 22 km tall. Mauna Kea, the largest mountain on earth (measured from base to peak, not from sea-level) is only 10 km by comparison. Everest, the tallest mountain on Earth, only clocks in at a measly 4 km.

Mars also has one of the deepest known valleys, Valles Marinaris, which can reach depths of 7 km in some places. However, Earth takes the lead with the Romanche Trench, a section of the Atlantic Ocean that drops to a crushing 7.8 km deep.

Of course, very little is known about the outer planets, and given the sheer scale of Jupiter and Saturn, we could make some assumptions about what lies beneath the thick gas layers.

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12y ago
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Q: What planet has the biggest mountains and deepest canyons than any other planet?
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