Books About Alien Civilizations

The Best Alien Civilizations Books for Kids

Looking for excellent children's books about alien civilizations? This collection brings together Bookroo's highest-rated and most useful picks in one place.

Start with our editorial favorites, then browse recommendations organized by reading stage to find the right book for your reader.

The Shortlist

Our 6 Favorite Books About Alien Civilizations

Starsight
Sale price
$2089
Chapter Book · Ages 12–+ · 2019

Starsight

By Brandon Sanderson · Book #2 in the Skyward series

A pilot uncovers terrifying truths about her world and her father's past.

461 pages· 123,167 words· Est. 13.5 hour read
4.3 Goodreads · 114,127 ratings
$21.99Save 5%
Hardcover
Summary: Spensa dreams of heroism in a war-torn galaxy, but her father's betrayal haunts her. As she ventures beyond her planet, she discovers unsettling truths about humanity's role in the cosmos. Are they the villains in this interstellar conflict? With each revelation, Spensa faces new questions about her identity and the nature of heroism. Determined to uncover the truth, she must navigate a web of lies and secrets that could redefine her world and her place in it. Will she find the answers she seeks, or will the stars reveal a darker destiny?
The Emerald Gate
Graphic Nov.
Sale price
$1348
Chapter Book · Ages 8–12 · 2022

The Emerald Gate

By Mark Siegel, Alexis Siegel, Xanthe Bouma (Illustrator), Matt Rockefeller (Illustrator), Boya Sun (Illustrator) · Book #5 in the 5 Worlds series

Oona must light the last beacon to save the 5 Worlds from impending doom.

272 pages· 6,738 words· Est. 1.5 hour read
4.3 Goodreads · 1,595 ratings
$13.99Save 4%
Paperback
Summary: In the thrilling finale of the 5 Worlds series, Oona, Jax, and An Tzu venture to the perilous world of Grimbo. Oona's mission: ignite the final beacon to save their universe. But with Stan Moon's dark powers rising and a potential betrayal looming, can Oona trust her friends? As danger intensifies on this mysterious, watery planet, the fate of the 5 Worlds hangs in the balance. Will Oona's courage and determination be enough to overcome the ultimate challenge, or will darkness prevail?
The Underwater Planet
Sale price
$759
Chapter Book · Ages 7–10 · 2016

The Underwater Planet

Can spacemice outsmart pirate spacecats to claim underwater treasure?

128 pages· 8,620 words· Est. 1 hour read
4.3 Goodreads · 479 ratings
$7.99Save 5%
Paperback
Summary: Geronimo Stiltonix, a daring spacemouse, discovers a treasure map leading to Aquarix, a mysterious underwater planet. Joined by his crew, he faces fur-eating seaweed, alien piranhas, and cunning pirate spacecats. As they dive deeper into the oceanic world, the spacemice must outwit the spacecats to secure the treasure. Will they succeed, or will the spacecats snatch the prize? Dive into this cosmic adventure to find out!
Rescue Rebellion
Sale price
$674
Chapter Book · Ages 7–10 · 2015

Rescue Rebellion

A comet threatens a planet of dinosaur-like beasts. Can spacemice save them and survive?

128 pages· 8,706 words· Est. 1 hour read
4.3 Goodreads · 411 ratings
$6.99Save 4%
Paperback
Summary: Geronimo Stiltonix and his crew race to the planet Jurassix to warn its inhabitants of an impending comet. But the locals are ferocious, dinosaur-like creatures with a taste for rodents. As the comet hurtles closer, the spacemice must navigate this perilous world, balancing their mission to save the aliens with their own survival. Will they find a way to avert disaster and escape the jaws of danger?
The Thief and the Sword
Graphic Nov.
Sale price
$1398
Chapter Book · Ages 8–12 · 2015

The Thief and the Sword

A stolen sword, a forbidden quest, and a prophecy that could change the galaxy's fate.

192 pages· 4,864 words· Est. 55 min read
4.2 Goodreads · 3,251 ratings
$14.99Save 7%
Paperback
Summary: In a distant future, Cleopatra faces a daunting challenge: retrieve a stolen ancient sword while navigating her new life at Yasiro Academy. Forbidden from leaving, she uncovers a prophecy naming her the galaxy's savior. With time tablets holding the key to her destiny, Cleo must embark on a perilous journey to secure them before they fall into the wrong hands. Will she defy her teachers and embrace her fate, or will the galaxy's future be lost forever?
Bright Family Vacation
Graphic Nov.
Sale price
$2089
Chapter Book · Ages 8–12 · 2023

Bright Family Vacation

By Gabe Soria, Ribs Rafa (Illustrator) · Book #2 in the The Bright Family series

A family vacation goes awry when a portal lands them on a mysterious jungle planet.

160 pages· 6,075 words· Est. 1 hour read
4.0 Goodreads · 56 ratings
$21.99Save 5%
Hardcover
Summary: The Bright family, fresh from multiverse adventures, seeks a relaxing vacation. But their plans derail when a portal misfires, stranding them in a jungle on an unknown planet. Can they navigate this new world and find their way back? With unexpected challenges and a bonus tale, 'One Birthday in Time,' this adventure promises more than just space ramen and water slides. Will the Brights' unity and problem-solving skills be enough to overcome the unknown?