Pluto has not been a planet since 2006. But this tiny world still inspires people of all ages while sparking controversy. In this delightfully witty book, astronomer Dean Regas teaches you how to educate your grown-up about the cutting-edge science of space, most crucially the reason why Pluto is NOT a planet any more. Delving into the history of space discoveries, the key players who have helped our understanding of the universe (including the 11-year-old girl who named Pluto in the first place) and the ever-changing nature of science, this book will equip every reader with the tools they need to bring their grown-ups fully up to speed, and to sneak in as many amazing astronomical facts as possible. And there's a handy quiz at the end so that you can check your grown-up has been paying attention!