Traveling to Cleanix to investigate why floating space junk has engulfed MouseStar 1, Geronimo finds that the planet's alien inhabitants are extremely wasteful and face the threat of rebellion by the robots they've thrown in the trash.

Spacemouse Geronimo Stiltonix's adventures are out of this world! MouseStar 1 is surrounded by floating space junk! It's yucky -- and dangerous. Geronimo Stiltonix tracks down the source of the junk, and meets very wasteful aliens. Even worse, robots that the aliens threw away have started to rebel! Can the spacemice restore harmony before the robots take over?

Explains the existence of God.

MouseStar 1 is surrounded by floating space junk! It's yucky -- and dangerous. It's coming from a nearby planet, Cleanix. Geronimo Stiltonix goes to visit, and discovers that the aliens there are very wasteful. Even worse, robots that they've thrown in the trash have started to rebel! Can the spacemice restore harmony before the robots take over?

"This book examines the proliferation of space debris in outer space and discusses methods of retrieving and disposing of the material."--

Geronimo Stilton meets outer space in this cosmically fun spin-off series! Meet Geronimo Stiltonix:He is a spacemouse -- the Geronimo Stilton of a parallel universe! He is captain of the spaceship MouseStar 1. While flying through the cosmos he visits distant planets and meets crazy aliens. His adventures are out of this world!ALIEN ESCAPEGeroimo Stiltonix's spaceship is in danger of exploding! The only solution is to replace the engine's batteries by tracking down a rare element. When a group of mysterious aliens claim they can help, Geronimo is relieved. But are the aliens as friendly as they seem?

Geronimo discovers a planet on the radar that mysteriously appears and disappears. MouseStar 1 lands to investigate and they discover mysterious aliens who hide a secret!

Holey cheese! Join Geronimo as he returns to the Kingdom of Fantasy for a third amazing adventure!In this 320-page, full-color hardcover adventure, Geronimo returns to the Kingdom of Fantasy when he learns that the Kingdom has fallen under an endless, freezing winter and the Queen of the Fairies is in danger. Once there, Geronimo explores fantastical new lands and travels on a magical talking ship. Can Geronimo extinguish a threatening volcano in time to restore peace and springtime to the Kingdom of Fantasy? He is put to the test on this extraordinary quest!

Geronimo Stilton meets outer space in this cosmically fun spin-off series! The spacemice have received an invitation to participate in the intergalactic soccerix championship. It's a tournament for the most popular sport in space! But Geronimo doesn't even know how to play soccerix, let alone lead a team to victory against aliens with bizarre skills (like flying)! Can the spacemice team prevail?