How hot is this tiny planet? Spark early readers' natural curiosity about planets with this inquiry-based nonfiction approach to Mercury.You know Mercury is the closest planet to the Sun. But did you know it's only a little bigger than Earth's Moon? Or that it has more craters than any other planet? Perfect for self-selection and early reports, this question-and-answer book covers Mercury's appearance and features, plus missions to the planet.A Quick Facts chart provides fast facts while simple infographics support visual learners. A Stay Curious! Learn More feature encourages kids to keep asking questions while doubling as a mini media literacy lesson on research skills. Includes glossary and index.