George's Secret Key to the Universe is a 2007 children's book written by Stephen and Lucy Hawking.


Its main characters are George, Eric, Annie, Dr. G. Reeper (or Greeper), and Cosmos, the world's most powerful computer. Cosmos can draw windows allowing people to look into outer space, as well as doors which act as portals allowing travel into outer space. It is written like a story and aims to describe various aspects of the universe in a manner that is accessible to children and others new to the topic. It starts by describing atoms, stars, planets and their moons. It then goes on to describe black holes, which remains the topic of focus in the last part of the book. This book is interesting for children because it is like a key to the universe and makes learning easier. At frequent intervals throughout the book, there are pictures and 'fact files' of the different references to universal objects, including a picture of Mars with its moons. It is intended for an audience age 9 and up.