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Mercury is the smallest planet in our solar system.

Mercury is the smallest planet in our solar system.

It is only a little bigger than our Moon. All eight planets circle the Sun, and Mercury is the tiniest one.

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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.