Hello, World! Planet EarthBy: Jill McDonald Series: Hello, World! Learn from home and explore the world with these fun and easy board books! Toddlers love to learn about the solar system. Here's a book all about our amazing planet Earth, with easy to understand facts about countries, continents, oceans, landforms, habitats, and Earth's place in space. Hello, World! is a series designed to introduce first nonfiction concepts to babies and toddlers. Told in clear and easy terms