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 & 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 & the perfect celebration of grandparents & grandchildren Particularly suitable for struggling reluctant & dyslexic readers aged 7