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

Written like a story, it aims to describe various aspects of the universe in a manner that is accessible to children and others new to the topic.

It was reported in June 2006 that Stephen and Lucy Hawking would be writing a children's book with Christophe Galfard, with the aim of "explaining theoretical physics in an accessible way to youngsters.

[3] Common Sense Media gave the book 2 stars out of 5, stating "The nonfiction parts are fine: good information, clearly told, with some spectacular photos.

This might be forgivable in straight sci-fi or fantasy ... but in a book that purports to teach the basics of astronomy and physics, it's just confusing -- how are young readers to know what's true, what's theoretical, and what's just plain nonsense?