Attention all young astronauts! Babies, toddlers, and preschoolers will learn all about the solar system, planet Earth, and the rockets that blast off into orbit in a boxed set that's out of this world! A sturdy case includes four durable board books: Solar System, Moon Landing, Planet Earth, and Rockets and Other Space Machines. Hello, World! is a series designed to introduce first nonfiction concepts to the youngest readers. Told in clear and easy terms and featuring bright, cheerful illustrations, Hello, World! makes learning fun. And each sturdy page offers helpful prompts for engaging with your child. It's a perfect way to bring science and nature into the busy world of babies, toddlers, and preschoolers, where learning never stops.