The bestselling nonfiction board book series is now available in a four-book space-themed boxed set--perfect for holiday gifts, birthdays, and baby showers. 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 this space-themed four-book boxed set. A sturdy box 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 babies and toddlers. Told in clear and easy terms and featuring bright, cheerful illustrations, Hello, World! makes learning fun for young children. 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 a toddler, where learning never stops.