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Mars has a volcano three times taller than Mount Everest.

Mars has a volcano three times taller than Mount Everest.

Olympus Mons stands about 22 km high — the biggest volcano in the whole solar system.

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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. Earth is the only planet we know of where things live. Earth is the only planet we know of where things live.