Adventuremice: Mice on the Moon by Philip Reeve

Little Pedro has an out-of-this-world adventure!The heroic Adventuremice have been summoned by an inventor-mouse! Millie's Uncle Bernie has built a spaceship and he wants the brave and clever Adventuremice to fly it. BOOM! Pedro and his friends blast into outer space, where they become the first mice on the moon. Or so they think .