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Saturn's rings are made of ice and rock.

Saturn's rings are made of ice and rock.

The rings are millions of icy chunks, some tiny and some big. They circle around Saturn like a giant hoop.

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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.