Because it is closer to the sun than any other planet in the solar system, the surface of Mercury is extremely hot. Readers will discover what it is like on the surface of this small planet. They will also find out how the planet was discovered, what it is made of, and how scientists are working to learn more about it today.Because it is closer to the sun than any other planet in the solar system, the surface of Mercury is extremely hot. Readers will discover what it is like on the surface of this small planet. They will also find out how the planet was discovered, what it is made of, and how scientists are working to learn more about it today.
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