Hello, World! is a series designed to help parents introduce simple nonfiction concepts to babies and toddlers. Now even the youngest children can enjoy learning about the world around them.
 
Every young child loves to look up at the moon in the night sky. Now here’s a book that can teach toddlers about the sun, moon, stars, and planets—with colors, shapes, sizes, and super-simple facts (“Can you point to the red planet? That’s Mars!”). 

Told in simple terms and featuring bright, simple, cheerful illustrations, Hello, World! makes learning easy for young children. And each page offers helpful prompts for engaging with your child. It’s a perfect way to bring natural science into the busy world of a toddler, where learning never stops. ---from amazon.com