How did Pluto stop being a planet? Are there other planets in space that could have life on them? This new series explores the cutting edge of popular science subjects - the place where theories are developed and discoveries made! Children will find out about the theories that explain some of the most interesting questions about space, and learn how to evaluate them. With hands-on novelties, funny artwork and light-hearted, informative text, this is the perfect book for budding astronomers, astrophysicists and cosmologists!