Discover what it is like on the surface of this small planet. A True Book: Space series dives into the many components that make each planet distinctive and exceptional, as well as explore many of the other components that make up Space. This series includes an age appropriate (grades 3-5) introduction to curriculum-relevant subjects and a robust resource section that encourages independent study. Because it is closer to the sun than any other planet in the solar system, the surface of Mercury is extremely hot. Readers will find out how the planet was discovered, what it is made of, and how scientists are working to learn more about it today.