11. The highest mountain known to man is the Olympus Mons, which is located on Mars. Its peak is 15 miles (25 kilometers) high, making it nearly 3 times higher than Mt. Everest.
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11. The highest mountain known to man is the Olympus Mons, which is located on Mars. Its peak is 15 miles (25 kilometers) high, making it nearly 3 times higher than Mt. Everest.