The Invisible Planet
Scholastic Paperbacks 2018
Great fit for 4th grade
Reading level and content both target 4th–8th grade · ages 9–14
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Genre
Themes
- teamwork
- friendship
- curiosity
- space exploration
- problem-solving
- bravery
- mystery
- ingenuity
About this book
When Geronimo Stilton and the crew of the MouseStar 1 spot a planet that keeps appearing and disappearing from their radar, they blast off to investigate. Their search leads them to strange new aliens and a puzzling secret hidden in the stars. Packed with colorful art, goofy humor, and cliffhanger chapters, this space adventure is perfect for elementary readers ready for longer chapter books. Fans love the fast pace, easy-to-follow science-fiction fun, and teamwork that saves the day.
Setting: outer space aboard the MouseStar 1 and a mysterious vanishing planet
Frequently Asked Questions
Is The Invisible Planet right for my child?
Yes — The Invisible Planet is a great fit for 4th grade. The reading level is AR 4.2, which is typical for 4th grade. The interest level is rated Middle Grades (4–8), meaning the themes and content are designed for ages 9–14 (4th–8th grade). Themes include teamwork, friendship, curiosity.
How long does it take to read The Invisible Planet?
At a typical 4th grade reading pace, The Invisible Planet takes around 1.3h to finish. The book has 11,500 words. Slower or faster readers may vary significantly.
Does The Invisible Planet have an AR quiz?
Yes — The Invisible Planet has an AR quiz available, worth 1 point. Your child will need to take and pass the quiz through their school's Accelerated Reader program to earn credit. The quiz is typically 5–20 multiple choice questions about plot, characters, and setting.
What grade level is The Invisible Planet?
The Invisible Planet has an AR reading level of 4.2, which places it at a 4th grade reading difficulty. The interest level is rated Middle Grades (4–8) — this reflects the age-appropriateness of the content and themes, not just the reading difficulty. A strong younger reader may handle the words fine while the themes are aimed at an older audience, or vice versa.