Billy is whisked away on a whistle-stop tour of the solar system by his grandfather, a retired astronaut. Can they brave the dangers and return intact? Billy's grandfather is a retired astronaut who likes to take Billy on trips around planet Earth.

But when the ship's computer takes over, they suddenly find themselves zooming away on a grand tour of the Solar System!

But when the computer system fails and Billy's grandfather is forced to pilot the ship manually through the treacherous asteroid belt!

Will they make it home alive? A fast-paced story filled with loads of awesome facts about our solar system and illustrated by Tony Ross.

With a reading age of 8, it is also suitable for reluctant, struggling and dyslexic readers.