Moon!: Earth's Best Friend: Our Universe, Book 3

Book review by
Regan McMahon, Common Sense Media
Moon!: Earth's Best Friend: Our Universe, Book 3 Book Poster Image
Fun, solid science couched in spirited friendship story.

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A lot or a little?

The parents' guide to what's in this book.

Educational Value

Packed with scientific facts about Earth, moon, other planets' moons, gravity, solar and lunar eclipses, how the moon affects Earth's tides, and more. Back matter lists key facts mentioned in the book and adds more, plus a true-false quiz about the moon (with answers). 

Positive Messages

"BFFs help each other out." "Don't worry, Moon Gazers." You're never without me." "Where earth goes, you go! Guess that makes us best friends, too."

Positive Role Models & Representations

Moon, the narrator, is friendly, enthusiastic, informative, and loves its best friend, Earth. Moon notes that only men have landed on the moon so far. "I'm still waiting for my first female astronaut." Moon points out that "untidy astronauts" left items on the moon, including an American flag, nail clippers, a golf ball, and a hammer.

Violence & Scariness

What parents need to know

Parents need to know that Moon! Earth's Best Friend is the third book in the Our Universe series by Stacy McAnulty that began with Earth! My First 4.54 Billion Years. It's full of fun facts about the moon, including how its size and gravity compare with Earth's, and how its gravity affects the tides on Earth. Charmingly illustrated by Stevie Lewis and narrated by the Moon itself, it's an engaging, kid-friendly science lesson. 

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What's the story?

MOON! EARTH'S BEST FRIEND begins with the narrator, the moon, explaining that the moon and Earth have been together since a space rock crashed into "baby Earth" about 4.5 billion years ago and created a big mess. "Pieces of rock, chunks of Earth, and even lava were blasted into space. This crash trash came together to make ME!" The moon goes on to tell all sorts of facts about the moon and Earth, including their relatives sizes, strengths of gravity, the moon's phases and effect on Earth's tides, how solar and lunar eclipses work, and more. 

Is it any good?

This fun, kid-friendly science lesson is couched as a cute and lively friendship story between Earth and the moon. Author Stacy McAnulty's choice to make the moon the narrator is a clever one, as it draws kids in and sweeps them up in the moon's bubbly enthusiasm. And Stevie Lewis' cartoon-like illustrations are loaded with personality and expressiveness. To show the difference between the moon and Earth's size and strength of gravity, he portrays them wearing workout head- and wristbands and lifting weights. Earth easily lifts a long barbell overhead one-handed, while the moon struggles to raise one small free weight, with sweat beads flying off her forehead. (Earth is referred to as "she/her" throughout the book.) 

Moon! Earth's Best Friend ends with a warm and comforting message to the reader: "Im always here for Earth. I'm always here for you. Where Earth goes, I go./ And where Earth goes, you go! Guess that makes us best friends, too."

Talk to your kids about ...

  • Families can talk about what they learned about the moon in Moon! Earth's Best Friend. What facts were new to you? What did you already know? 

  • What fact surprised you the most about the moon? 

  • Why do you think the author decided to talk about Earth and the moon as if they were best friends? How did that help you understand how the two are connected? 

Book details

Our editors recommend

For kids who love science and outer space

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