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Mars is home to the tallest volcano in the Solar System, called Olympus Mons.

Mars is home to the tallest volcano in the Solar System, called Olympus Mons.

Olympus Mons is about three times taller than Mount Everest — roughly 22 km high — and nearly as wide as the whole country of Italy. Mars looks red because its soil is full of rusty iron.

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More facts about Planets

Mars has a volcano three times taller than Mount Everest. Mars has a volcano three times taller than Mount Everest. Scientists think it rains diamonds inside Neptune and Uranus. Scientists think it rains diamonds inside Neptune and Uranus. Mercury is the planet closest to the Sun. Mercury is the planet closest to the Sun. A day on Venus is longer than a whole year on Venus. A day on Venus is longer than a whole year on Venus. Mars is called the Red Planet because of its rusty dust. Mars is called the Red Planet because of its rusty dust.