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Human satellites and space shuttles have never probed beyond the further most reaches of the solar system, let alone galaxy, which makes it impossible to correctly answer which planet has the tallest mountain, but it is known that gas giants (Neptune, Uranus, Saturn, Jupiter and so forth) cannot possibly have any form of landscape as they have no large amounts of solid material, and currently the tallest known mountain is on Mars; the mountain being upside of three times the scale of Mount Everest, and over twice the size of the underwater Mauna Keia.

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14y ago

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