- This book mixes facts and fantasy, imagination and science, excitement and knowledge. Because learning and experiencing go hand in hand. Read it for yourself . . . and discover it for yourself! An exciting and informative book about the universe. A unique mix between fiction and non-fiction, for curious readers ages 9 and up. Are you ready for the journey of a lifetime? Jump on board of the Mars Cruiser with Luke and Maya, and travel to a different planet! While the earth is getting smaller and smaller, and the stars shoot past the window, you'll discover all the secrets of the universe. From planets to supernovae and from black holes to aliens: this will be an unforgettable journey!