Hello, World! is a series designed to help parents introduce simple nonfiction concepts to their babies and toddlers. Now even the youngest children can enjoy learning about the world around them.

Narrated in simple terms and featuring bright, simple, cheerful illustrations, Hello, World! makes learning easy for young children. Each page offers helpful prompts for engaging with your child.

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!”). It's a perfect way to bring natural science into the busy world of a toddler, where learning never stops.

“A cheerful introduction to outer space.”—Booklist

“Supplemental tidbits (“Ouch! Asteroids and comets often hit this planet,” [McDonald] writes about Mercury) offer additional details to pique the interest of children just hearing about Earth's cosmic neighbors for the first time.”—Publishers Weekly