Olympus Mons — the tallest mountain in our solar system — is 374 miles (624 km) in diameter. (Smithsonian Magazine, NASA) Thanks to some fun astronomy facts, we know that Olympus Mons is approximately the size of Arizona. The mountain’s located on Mars, and it is the planet’s largest volcano and the biggest mountain in our solar system. Furthermore, Mount Everest is like a tiny hill compared to Olympus Mons; the mountain’s peak is 16 miles (25 km) high, making it nearly three times taller than Mount Everest.

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