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 fun, fast-paced story filled with facts about the solar system, and the perfect celebration of grandparents and grandchildren. Particularly suitable for struggling, reluctant and dyslexic readers aged 7+